masters dissertation systematic review example

Systematic Reviews

Introduction
Guidelines and procedures
Management tools
Define the question
Check the topic
Determine inclusion/exclusion criteria
Develop a protocol
Identify keywords
Databases and search strategies
Grey literature
Manage and organise
Screen & Select
Locate full text
Extract data

Example reviews

Examples of systematic reviews
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Please choose the tab below for your discipline to see relevant examples.

For more information about how to conduct and write reviews, please see the Guidelines section of this guide.

Health & Medicine
Social sciences
Vibration and bubbles: a systematic review of the effects of helicopter retrieval on injured divers. (2018).
Nicotine effects on exercise performance and physiological responses in nicotine‐naïve individuals: a systematic review. (2018).
Association of total white cell count with mortality and major adverse events in patients with peripheral arterial disease: A systematic review. (2014).
Do MOOCs contribute to student equity and social inclusion? A systematic review 2014–18. (2020).
Interventions in Foster Family Care: A Systematic Review. (2020).
Determinants of happiness among healthcare professionals between 2009 and 2019: a systematic review. (2020).
Systematic review of the outcomes and trade-offs of ten types of decarbonization policy instruments. (2021).
A systematic review on Asian's farmers' adaptation practices towards climate change. (2018).
Are concentrations of pollutants in sharks, rays and skates (Elasmobranchii) a cause for concern? A systematic review. (2020).
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Doing a Systematic Review: A Student's Guide

Student resources, chapter 1: carrying out a systematic review as a master's thesis.

What Is The Difference Between A Systematic Review And A Meta-Analysis?

What Is The Difference Between A Narrative Review And A Systematic Review With Narrative Synthesis?

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Methodology
Systematic Review | Definition, Examples & Guide

Systematic Review | Definition, Examples & Guide

Published on 15 June 2022 by Shaun Turney . Revised on 18 July 2024.

A systematic review is a type of review that uses repeatable methods to find, select, and synthesise all available evidence. It answers a clearly formulated research question and explicitly states the methods used to arrive at the answer.

They answered the question ‘What is the effectiveness of probiotics in reducing eczema symptoms and improving quality of life in patients with eczema?’

In this context, a probiotic is a health product that contains live microorganisms and is taken by mouth. Eczema is a common skin condition that causes red, itchy skin.

What is a systematic review, systematic review vs meta-analysis, systematic review vs literature review, systematic review vs scoping review, when to conduct a systematic review, pros and cons of systematic reviews, step-by-step example of a systematic review, frequently asked questions about systematic reviews.

A review is an overview of the research that’s already been completed on a topic.

What makes a systematic review different from other types of reviews is that the research methods are designed to reduce research bias . The methods are repeatable , and the approach is formal and systematic:

Formulate a research question
Develop a protocol
Search for all relevant studies
Apply the selection criteria
Extract the data
Synthesise the data
Write and publish a report

Although multiple sets of guidelines exist, the Cochrane Handbook for Systematic Reviews is among the most widely used. It provides detailed guidelines on how to complete each step of the systematic review process.

Systematic reviews are most commonly used in medical and public health research, but they can also be found in other disciplines.

Systematic reviews typically answer their research question by synthesising all available evidence and evaluating the quality of the evidence. Synthesising means bringing together different information to tell a single, cohesive story. The synthesis can be narrative ( qualitative ), quantitative , or both.

Prevent plagiarism, run a free check.

Systematic reviews often quantitatively synthesise the evidence using a meta-analysis . A meta-analysis is a statistical analysis, not a type of review.

A meta-analysis is a technique to synthesise results from multiple studies. It’s a statistical analysis that combines the results of two or more studies, usually to estimate an effect size .

A literature review is a type of review that uses a less systematic and formal approach than a systematic review. Typically, an expert in a topic will qualitatively summarise and evaluate previous work, without using a formal, explicit method.

Although literature reviews are often less time-consuming and can be insightful or helpful, they have a higher risk of bias and are less transparent than systematic reviews.

Similar to a systematic review, a scoping review is a type of review that tries to minimise bias by using transparent and repeatable methods.

However, a scoping review isn’t a type of systematic review. The most important difference is the goal: rather than answering a specific question, a scoping review explores a topic. The researcher tries to identify the main concepts, theories, and evidence, as well as gaps in the current research.

Sometimes scoping reviews are an exploratory preparation step for a systematic review, and sometimes they are a standalone project.

A systematic review is a good choice of review if you want to answer a question about the effectiveness of an intervention , such as a medical treatment.

To conduct a systematic review, you’ll need the following:

A precise question , usually about the effectiveness of an intervention. The question needs to be about a topic that’s previously been studied by multiple researchers. If there’s no previous research, there’s nothing to review.
If you’re doing a systematic review on your own (e.g., for a research paper or thesis), you should take appropriate measures to ensure the validity and reliability of your research.
Access to databases and journal archives. Often, your educational institution provides you with access.
Time. A professional systematic review is a time-consuming process: it will take the lead author about six months of full-time work. If you’re a student, you should narrow the scope of your systematic review and stick to a tight schedule.
Bibliographic, word-processing, spreadsheet, and statistical software . For example, you could use EndNote, Microsoft Word, Excel, and SPSS.

A systematic review has many pros .

They minimise research b ias by considering all available evidence and evaluating each study for bias.
Their methods are transparent , so they can be scrutinised by others.
They’re thorough : they summarise all available evidence.
They can be replicated and updated by others.

Systematic reviews also have a few cons .

They’re time-consuming .
They’re narrow in scope : they only answer the precise research question.

The 7 steps for conducting a systematic review are explained with an example.

Step 1: Formulate a research question

Formulating the research question is probably the most important step of a systematic review. A clear research question will:

Allow you to more effectively communicate your research to other researchers and practitioners
Guide your decisions as you plan and conduct your systematic review

A good research question for a systematic review has four components, which you can remember with the acronym PICO :

Population(s) or problem(s)
Intervention(s)
Comparison(s)

You can rearrange these four components to write your research question:

What is the effectiveness of I versus C for O in P ?

Sometimes, you may want to include a fourth component, the type of study design . In this case, the acronym is PICOT .

Type of study design(s)
The population of patients with eczema
The intervention of probiotics
In comparison to no treatment, placebo , or non-probiotic treatment
The outcome of changes in participant-, parent-, and doctor-rated symptoms of eczema and quality of life
Randomised control trials, a type of study design

Their research question was:

What is the effectiveness of probiotics versus no treatment, a placebo, or a non-probiotic treatment for reducing eczema symptoms and improving quality of life in patients with eczema?

Step 2: Develop a protocol

A protocol is a document that contains your research plan for the systematic review. This is an important step because having a plan allows you to work more efficiently and reduces bias.

Your protocol should include the following components:

Background information : Provide the context of the research question, including why it’s important.
Research objective(s) : Rephrase your research question as an objective.
Selection criteria: State how you’ll decide which studies to include or exclude from your review.
Search strategy: Discuss your plan for finding studies.
Analysis: Explain what information you’ll collect from the studies and how you’ll synthesise the data.

If you’re a professional seeking to publish your review, it’s a good idea to bring together an advisory committee . This is a group of about six people who have experience in the topic you’re researching. They can help you make decisions about your protocol.

It’s highly recommended to register your protocol. Registering your protocol means submitting it to a database such as PROSPERO or ClinicalTrials.gov .

Step 3: Search for all relevant studies

Searching for relevant studies is the most time-consuming step of a systematic review.

To reduce bias, it’s important to search for relevant studies very thoroughly. Your strategy will depend on your field and your research question, but sources generally fall into these four categories:

Databases: Search multiple databases of peer-reviewed literature, such as PubMed or Scopus . Think carefully about how to phrase your search terms and include multiple synonyms of each word. Use Boolean operators if relevant.
Handsearching: In addition to searching the primary sources using databases, you’ll also need to search manually. One strategy is to scan relevant journals or conference proceedings. Another strategy is to scan the reference lists of relevant studies.
Grey literature: Grey literature includes documents produced by governments, universities, and other institutions that aren’t published by traditional publishers. Graduate student theses are an important type of grey literature, which you can search using the Networked Digital Library of Theses and Dissertations (NDLTD) . In medicine, clinical trial registries are another important type of grey literature.
Experts: Contact experts in the field to ask if they have unpublished studies that should be included in your review.

At this stage of your review, you won’t read the articles yet. Simply save any potentially relevant citations using bibliographic software, such as Scribbr’s APA or MLA Generator .

Databases: EMBASE, PsycINFO, AMED, LILACS, and ISI Web of Science
Handsearch: Conference proceedings and reference lists of articles
Grey literature: The Cochrane Library, the metaRegister of Controlled Trials, and the Ongoing Skin Trials Register
Experts: Authors of unpublished registered trials, pharmaceutical companies, and manufacturers of probiotics

Step 4: Apply the selection criteria

Applying the selection criteria is a three-person job. Two of you will independently read the studies and decide which to include in your review based on the selection criteria you established in your protocol . The third person’s job is to break any ties.

To increase inter-rater reliability , ensure that everyone thoroughly understands the selection criteria before you begin.

If you’re writing a systematic review as a student for an assignment, you might not have a team. In this case, you’ll have to apply the selection criteria on your own; you can mention this as a limitation in your paper’s discussion.

You should apply the selection criteria in two phases:

Based on the titles and abstracts : Decide whether each article potentially meets the selection criteria based on the information provided in the abstracts.
Based on the full texts: Download the articles that weren’t excluded during the first phase. If an article isn’t available online or through your library, you may need to contact the authors to ask for a copy. Read the articles and decide which articles meet the selection criteria.

It’s very important to keep a meticulous record of why you included or excluded each article. When the selection process is complete, you can summarise what you did using a PRISMA flow diagram .

Next, Boyle and colleagues found the full texts for each of the remaining studies. Boyle and Tang read through the articles to decide if any more studies needed to be excluded based on the selection criteria.

When Boyle and Tang disagreed about whether a study should be excluded, they discussed it with Varigos until the three researchers came to an agreement.

Step 5: Extract the data

Extracting the data means collecting information from the selected studies in a systematic way. There are two types of information you need to collect from each study:

Information about the study’s methods and results . The exact information will depend on your research question, but it might include the year, study design , sample size, context, research findings , and conclusions. If any data are missing, you’ll need to contact the study’s authors.
Your judgement of the quality of the evidence, including risk of bias .

You should collect this information using forms. You can find sample forms in The Registry of Methods and Tools for Evidence-Informed Decision Making and the Grading of Recommendations, Assessment, Development and Evaluations Working Group .

Extracting the data is also a three-person job. Two people should do this step independently, and the third person will resolve any disagreements.

They also collected data about possible sources of bias, such as how the study participants were randomised into the control and treatment groups.

Step 6: Synthesise the data

Synthesising the data means bringing together the information you collected into a single, cohesive story. There are two main approaches to synthesising the data:

Narrative ( qualitative ): Summarise the information in words. You’ll need to discuss the studies and assess their overall quality.
Quantitative : Use statistical methods to summarise and compare data from different studies. The most common quantitative approach is a meta-analysis , which allows you to combine results from multiple studies into a summary result.

Generally, you should use both approaches together whenever possible. If you don’t have enough data, or the data from different studies aren’t comparable, then you can take just a narrative approach. However, you should justify why a quantitative approach wasn’t possible.

Boyle and colleagues also divided the studies into subgroups, such as studies about babies, children, and adults, and analysed the effect sizes within each group.

Step 7: Write and publish a report

The purpose of writing a systematic review article is to share the answer to your research question and explain how you arrived at this answer.

Your article should include the following sections:

Abstract : A summary of the review
Introduction : Including the rationale and objectives
Methods : Including the selection criteria, search method, data extraction method, and synthesis method
Results : Including results of the search and selection process, study characteristics, risk of bias in the studies, and synthesis results
Discussion : Including interpretation of the results and limitations of the review
Conclusion : The answer to your research question and implications for practice, policy, or research

To verify that your report includes everything it needs, you can use the PRISMA checklist .

Once your report is written, you can publish it in a systematic review database, such as the Cochrane Database of Systematic Reviews , and/or in a peer-reviewed journal.

A systematic review is secondary research because it uses existing research. You don’t collect new data yourself.

A literature review is a survey of scholarly sources (such as books, journal articles, and theses) related to a specific topic or research question .

It is often written as part of a dissertation , thesis, research paper , or proposal .

There are several reasons to conduct a literature review at the beginning of a research project:

To familiarise yourself with the current state of knowledge on your topic
To ensure that you’re not just repeating what others have already done
To identify gaps in knowledge and unresolved problems that your research can address
To develop your theoretical framework and methodology
To provide an overview of the key findings and debates on the topic

Writing the literature review shows your reader how your work relates to existing research and what new insights it will contribute.

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Turney, S. (2024, July 17). Systematic Review | Definition, Examples & Guide. Scribbr. Retrieved 3 September 2024, from https://www.scribbr.co.uk/research-methods/systematic-reviews/

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Knowledge Base

Methodology

Systematic Review | Definition, Example, & Guide

Systematic Review | Definition, Example & Guide

Published on June 15, 2022 by Shaun Turney . Revised on November 20, 2023.

A systematic review is a type of review that uses repeatable methods to find, select, and synthesize all available evidence. It answers a clearly formulated research question and explicitly states the methods used to arrive at the answer.

They answered the question “What is the effectiveness of probiotics in reducing eczema symptoms and improving quality of life in patients with eczema?”

In this context, a probiotic is a health product that contains live microorganisms and is taken by mouth. Eczema is a common skin condition that causes red, itchy skin.

What is a systematic review, systematic review vs. meta-analysis, systematic review vs. literature review, systematic review vs. scoping review, when to conduct a systematic review, pros and cons of systematic reviews, step-by-step example of a systematic review, other interesting articles, frequently asked questions about systematic reviews.

A review is an overview of the research that’s already been completed on a topic.

What makes a systematic review different from other types of reviews is that the research methods are designed to reduce bias . The methods are repeatable, and the approach is formal and systematic:

Formulate a research question
Develop a protocol
Search for all relevant studies
Apply the selection criteria
Extract the data
Synthesize the data
Write and publish a report

Systematic reviews are most commonly used in medical and public health research, but they can also be found in other disciplines.

Systematic reviews typically answer their research question by synthesizing all available evidence and evaluating the quality of the evidence. Synthesizing means bringing together different information to tell a single, cohesive story. The synthesis can be narrative ( qualitative ), quantitative , or both.

Receive feedback on language, structure, and formatting

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See an example

masters dissertation systematic review example

Systematic reviews often quantitatively synthesize the evidence using a meta-analysis . A meta-analysis is a statistical analysis, not a type of review.

A meta-analysis is a technique to synthesize results from multiple studies. It’s a statistical analysis that combines the results of two or more studies, usually to estimate an effect size .

A literature review is a type of review that uses a less systematic and formal approach than a systematic review. Typically, an expert in a topic will qualitatively summarize and evaluate previous work, without using a formal, explicit method.

Although literature reviews are often less time-consuming and can be insightful or helpful, they have a higher risk of bias and are less transparent than systematic reviews.

Similar to a systematic review, a scoping review is a type of review that tries to minimize bias by using transparent and repeatable methods.

Sometimes scoping reviews are an exploratory preparation step for a systematic review, and sometimes they are a standalone project.

Prevent plagiarism. Run a free check.

A systematic review is a good choice of review if you want to answer a question about the effectiveness of an intervention , such as a medical treatment.

To conduct a systematic review, you’ll need the following:

A precise question , usually about the effectiveness of an intervention. The question needs to be about a topic that’s previously been studied by multiple researchers. If there’s no previous research, there’s nothing to review.
If you’re doing a systematic review on your own (e.g., for a research paper or thesis ), you should take appropriate measures to ensure the validity and reliability of your research.
Access to databases and journal archives. Often, your educational institution provides you with access.
Time. A professional systematic review is a time-consuming process: it will take the lead author about six months of full-time work. If you’re a student, you should narrow the scope of your systematic review and stick to a tight schedule.
Bibliographic, word-processing, spreadsheet, and statistical software . For example, you could use EndNote, Microsoft Word, Excel, and SPSS.

A systematic review has many pros .

They minimize research bias by considering all available evidence and evaluating each study for bias.
Their methods are transparent , so they can be scrutinized by others.
They’re thorough : they summarize all available evidence.
They can be replicated and updated by others.

Systematic reviews also have a few cons .

They’re time-consuming .
They’re narrow in scope : they only answer the precise research question.

The 7 steps for conducting a systematic review are explained with an example.

Step 1: Formulate a research question

Formulating the research question is probably the most important step of a systematic review. A clear research question will:

Allow you to more effectively communicate your research to other researchers and practitioners
Guide your decisions as you plan and conduct your systematic review

A good research question for a systematic review has four components, which you can remember with the acronym PICO :

Population(s) or problem(s)
Intervention(s)
Comparison(s)

You can rearrange these four components to write your research question:

What is the effectiveness of I versus C for O in P ?

Sometimes, you may want to include a fifth component, the type of study design . In this case, the acronym is PICOT .

Type of study design(s)
The population of patients with eczema
The intervention of probiotics
In comparison to no treatment, placebo , or non-probiotic treatment
The outcome of changes in participant-, parent-, and doctor-rated symptoms of eczema and quality of life
Randomized control trials, a type of study design

Their research question was:

What is the effectiveness of probiotics versus no treatment, a placebo, or a non-probiotic treatment for reducing eczema symptoms and improving quality of life in patients with eczema?

Step 2: Develop a protocol

A protocol is a document that contains your research plan for the systematic review. This is an important step because having a plan allows you to work more efficiently and reduces bias.

Your protocol should include the following components:

Background information : Provide the context of the research question, including why it’s important.
Research objective (s) : Rephrase your research question as an objective.
Selection criteria: State how you’ll decide which studies to include or exclude from your review.
Search strategy: Discuss your plan for finding studies.
Analysis: Explain what information you’ll collect from the studies and how you’ll synthesize the data.

It’s highly recommended to register your protocol. Registering your protocol means submitting it to a database such as PROSPERO or ClinicalTrials.gov .

Step 3: Search for all relevant studies

Searching for relevant studies is the most time-consuming step of a systematic review.

Databases: Search multiple databases of peer-reviewed literature, such as PubMed or Scopus . Think carefully about how to phrase your search terms and include multiple synonyms of each word. Use Boolean operators if relevant.
Handsearching: In addition to searching the primary sources using databases, you’ll also need to search manually. One strategy is to scan relevant journals or conference proceedings. Another strategy is to scan the reference lists of relevant studies.
Gray literature: Gray literature includes documents produced by governments, universities, and other institutions that aren’t published by traditional publishers. Graduate student theses are an important type of gray literature, which you can search using the Networked Digital Library of Theses and Dissertations (NDLTD) . In medicine, clinical trial registries are another important type of gray literature.
Experts: Contact experts in the field to ask if they have unpublished studies that should be included in your review.

At this stage of your review, you won’t read the articles yet. Simply save any potentially relevant citations using bibliographic software, such as Scribbr’s APA or MLA Generator .

Databases: EMBASE, PsycINFO, AMED, LILACS, and ISI Web of Science
Handsearch: Conference proceedings and reference lists of articles
Gray literature: The Cochrane Library, the metaRegister of Controlled Trials, and the Ongoing Skin Trials Register
Experts: Authors of unpublished registered trials, pharmaceutical companies, and manufacturers of probiotics

Step 4: Apply the selection criteria

To increase inter-rater reliability , ensure that everyone thoroughly understands the selection criteria before you begin.

You should apply the selection criteria in two phases:

Based on the titles and abstracts : Decide whether each article potentially meets the selection criteria based on the information provided in the abstracts.
Based on the full texts: Download the articles that weren’t excluded during the first phase. If an article isn’t available online or through your library, you may need to contact the authors to ask for a copy. Read the articles and decide which articles meet the selection criteria.

It’s very important to keep a meticulous record of why you included or excluded each article. When the selection process is complete, you can summarize what you did using a PRISMA flow diagram .

When Boyle and Tang disagreed about whether a study should be excluded, they discussed it with Varigos until the three researchers came to an agreement.

Step 5: Extract the data

Extracting the data means collecting information from the selected studies in a systematic way. There are two types of information you need to collect from each study:

Information about the study’s methods and results . The exact information will depend on your research question, but it might include the year, study design , sample size, context, research findings , and conclusions. If any data are missing, you’ll need to contact the study’s authors.
Your judgment of the quality of the evidence, including risk of bias .

Extracting the data is also a three-person job. Two people should do this step independently, and the third person will resolve any disagreements.

They also collected data about possible sources of bias, such as how the study participants were randomized into the control and treatment groups.

Step 6: Synthesize the data

Synthesizing the data means bringing together the information you collected into a single, cohesive story. There are two main approaches to synthesizing the data:

Narrative ( qualitative ): Summarize the information in words. You’ll need to discuss the studies and assess their overall quality.
Quantitative : Use statistical methods to summarize and compare data from different studies. The most common quantitative approach is a meta-analysis , which allows you to combine results from multiple studies into a summary result.

Boyle and colleagues also divided the studies into subgroups, such as studies about babies, children, and adults, and analyzed the effect sizes within each group.

Step 7: Write and publish a report

The purpose of writing a systematic review article is to share the answer to your research question and explain how you arrived at this answer.

Your article should include the following sections:

Abstract : A summary of the review
Introduction : Including the rationale and objectives
Methods : Including the selection criteria, search method, data extraction method, and synthesis method
Results : Including results of the search and selection process, study characteristics, risk of bias in the studies, and synthesis results
Discussion : Including interpretation of the results and limitations of the review
Conclusion : The answer to your research question and implications for practice, policy, or research

To verify that your report includes everything it needs, you can use the PRISMA checklist .

Once your report is written, you can publish it in a systematic review database, such as the Cochrane Database of Systematic Reviews , and/or in a peer-reviewed journal.

In their report, Boyle and colleagues concluded that probiotics cannot be recommended for reducing eczema symptoms or improving quality of life in patients with eczema. Note Generative AI tools like ChatGPT can be useful at various stages of the writing and research process and can help you to write your systematic review. However, we strongly advise against trying to pass AI-generated text off as your own work.

If you want to know more about statistics , methodology , or research bias , make sure to check out some of our other articles with explanations and examples.

Student’s t -distribution
Normal distribution
Null and Alternative Hypotheses
Chi square tests
Confidence interval
Quartiles & Quantiles
Cluster sampling
Stratified sampling
Data cleansing
Reproducibility vs Replicability
Peer review
Prospective cohort study

Research bias

Implicit bias
Cognitive bias
Placebo effect
Hawthorne effect
Hindsight bias
Affect heuristic
Social desirability bias

A literature review is a survey of scholarly sources (such as books, journal articles, and theses) related to a specific topic or research question .

It is often written as part of a thesis, dissertation , or research paper , in order to situate your work in relation to existing knowledge.

A literature review is a survey of credible sources on a topic, often used in dissertations , theses, and research papers . Literature reviews give an overview of knowledge on a subject, helping you identify relevant theories and methods, as well as gaps in existing research. Literature reviews are set up similarly to other academic texts , with an introduction , a main body, and a conclusion .

An annotated bibliography is a list of source references that has a short description (called an annotation ) for each of the sources. It is often assigned as part of the research process for a paper .

A systematic review is secondary research because it uses existing research. You don’t collect new data yourself.

Cite this Scribbr article

If you want to cite this source, you can copy and paste the citation or click the “Cite this Scribbr article” button to automatically add the citation to our free Citation Generator.

Turney, S. (2023, November 20). Systematic Review | Definition, Example & Guide. Scribbr. Retrieved September 3, 2024, from https://www.scribbr.com/methodology/systematic-review/

Is this article helpful?

Shaun Turney

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How to Do a Systematic Review: A Best Practice Guide for Conducting and Reporting Narrative Reviews, Meta-Analyses, and Meta-Syntheses

Affiliations.

1 Behavioural Science Centre, Stirling Management School, University of Stirling, Stirling FK9 4LA, United Kingdom; email: [email protected].
2 Department of Psychological and Behavioural Science, London School of Economics and Political Science, London WC2A 2AE, United Kingdom.
3 Department of Statistics, Northwestern University, Evanston, Illinois 60208, USA; email: [email protected].
PMID: 30089228
DOI: 10.1146/annurev-psych-010418-102803

Systematic reviews are characterized by a methodical and replicable methodology and presentation. They involve a comprehensive search to locate all relevant published and unpublished work on a subject; a systematic integration of search results; and a critique of the extent, nature, and quality of evidence in relation to a particular research question. The best reviews synthesize studies to draw broad theoretical conclusions about what a literature means, linking theory to evidence and evidence to theory. This guide describes how to plan, conduct, organize, and present a systematic review of quantitative (meta-analysis) or qualitative (narrative review, meta-synthesis) information. We outline core standards and principles and describe commonly encountered problems. Although this guide targets psychological scientists, its high level of abstraction makes it potentially relevant to any subject area or discipline. We argue that systematic reviews are a key methodology for clarifying whether and how research findings replicate and for explaining possible inconsistencies, and we call for researchers to conduct systematic reviews to help elucidate whether there is a replication crisis.

Keywords: evidence; guide; meta-analysis; meta-synthesis; narrative; systematic review; theory.

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How to Write a Systematic Review Dissertation: With Examples

Writing a systematic review dissertation isn’t easy because you must follow a thorough and accurate scientific process. You must be an expert in research methodology to synthesise studies. In this article, I will provide a step-by-step approach to writing a top-notch systematic review dissertation.

Table of Contents

However, for students who may find this process challenging and seek professional assistance, I recommend exploring SystematicReviewPro —a reliable systematic review writing service. By signing up and placing a free inquiry and engaging with the admin team at any time, students can avail themselves of an exclusive offer of up to 50% off on their systematic review order. Additionally, there is already a 30% discount running on the website, making it an excellent opportunity to ease your dissertation journey.

As an Undergraduate or Master’s student, you’re are allowed to pick a systematic review for your dissertation. As a PhD student, you can use a systematic review methodology in the second chapter (literature review) of your dissertation. A systematic review is considered the highest level of empirical evidence, especially in clinical sciences like nursing and medicine. When developing new practice guidelines, new services, or new products, systematic reviews are searched and synthesised first on that topic or idea.

Factors to Consider When Writing a Systematic Review Dissertation

The nature of your research topic or research question.

Some research topics or questions strictly conform to qualitative or quantitative methods. For example, if you’re exploring the lived experiences, attitudes, perceptions, and meaning-making in a given population, you’ll need qualitative methods. However, you will require quantitative methods if looking into quantifiable variables like happiness, depression, academic performance, sleep, etc. That said, the nature of your research question should guide you. If your topic is qualitative, you’ll need qualitative studies only. If your topic is quantitative, you’ll need quantitative studies only. Systematic reviews of qualitative studies are less intricate than of quantitative studies. Still, they require a thoughtful approach in synthesizing findings from various qualitative studies.

If you choose to review quantitative studies, you might need to conduct a meta-analysis in your systematic review. A meta-analysis refers to statistical techniques used in pooling findings from various independent studies to compute a summary statistic. For example, in your dissertation, you may aim to investigate the effect of a student well-being programme embedded in university classes on the happiness of university students. Various studies that have investigated the same or a related intervention and quantitively measured happiness among university students must be synthesised together using a statistical technique. The ultimate outcome of that meta-analysis is to provide an overview of the overall trend of the effect of the intervention on university student’s happiness. For more information about how to formulate a research question for a systematic review with a meta-analysis, visit this link.

An example meta-analysis showing the statistical combination of findings from various studies to indicate the overall effect of a psychological intervention on the psychological well-being of university students.

Availability of primary studies

Finding primary studies for your systematic review is the hardest thing you can encounter with this approach. You can choose your topic and plan your journey so well. Upon reaching the point you need primary studies to answer your research question, you get stuck. Retrieving primary studies is challenging because it requires advanced search strategies on various online databases. Doing an advanced search strategy can be an uphill task for someone who has never done a systematic review. This is because, more often than not, depending on the topic, primary studies are not readily available on the Internet. Remember, secondary studies, like systematic reviews and literature reviews, are not eligible for systematic reviews.

Supervisor’s recommendation

Always confirm with your supervisor if you can do a systematic review dissertation. Some supervisors may feel it better for you to do a primary study. So, always confirm with your supervisor before doing much.

Your confidence

Always ensure you’re confident that you can do a systematic review on your own. Writing a systematic review isn’t easy. You need to be aware that doing a systematic review may even be harder than doing interviews or surveys in primary research. Why? A systematic review involves combining many primary studies together in a scientific manner. That means you must have expertise in various research methodologies to know the best way to integrate or synthesise the various studies.

Availability of time and resources

The main advantage of doing a systematic review dissertation is that it saves a lot of time. Conducting interviews or surveys can be time- and resource-consuming. However, with a systematic review, you do everything from your desk. It will save you a lot of time and resources. If you find that you meet many of the requirements of successfully conducting a systematic review, the next step is to engage in the actual process. The step-by-step approach used in writing systematic reviews is outlined below.

Step-by-Step Process in Writing a Systematic Review Dissertation

The following steps are iterative, meaning you can start over again and again until you meet your research objectives. The step-by-step guide on how to write a systematic review dissertation is summarized in the infographic shown below.

Step-by-step guide on how to write a systematic review dissertation

Step 1: Formulate the systematic review research question

The starting point of a systematic review is to formulate a research question. As stated above, the nature of your research question will help you make key decisions. For example, you will be able to know which design (quantitative versus qualitative) to consider in your inclusion and exclusion criteria.

Step 2: Do a preliminary search

The next step is to perform a preliminary search on the Internet to determine if another systematic review has been published. It is not acceptable to repeat what has already been done. Your research should be novel and contribute to a knowledge gap. However, if you find that another systematic review has already been published on your topic. You should consider the publication date.

In most cases, systematic reviews on given topics are outdated. They have not used recent studies published on that topic, thus missing important updates. That can be a good reason you’re conducting your study. Suppose there’s an updated systematic review on your topic. In that case, you should consider reformulating your research question to address a specific knowledge gap.

Step 3: Develop your systematic review inclusion and exclusion criteria

One unique thing about systematic reviews is that they must be based on a very specific population, intervention/exposure, and assess a specific outcome. Let’s say, for example, you write on Intervention A’s effectiveness in reducing depression symptoms in older frail people. In that case, you must retrieve studies that strictly assess the effectiveness of Intervention A, the outcome being depression symptoms and the population being older frail people.

Therefore, it will be against the principles of a systematic review to focus on Intervention B (different intervention/exposure) on anxiety (different outcomes) in younger people (different populations). Also, depending on your research question, you will need to determine the research design (qualitative versus quantitative) of the studies you will review. Other criteria to consider are the country of publication, the publication date, language, etc.

Step 4: Develop your systematic review search strategy

As said, the main challenge in writing a systematic review is to identify papers. Your literature search should be thorough so that you don’t leave out some relevant studies. Developing a literature search strategy isn’t easy because you must start identifying relevant keywords and search terms for your topic. You must start by knowing common terminologies used in your subject of interest.

Afterward, combine the keywords using Boolean connectors like “AND” & “OR.” For example, suppose my topic is the effectiveness of cognitive behavioural therapy in treating anxiety in adolescents. In that regard, I can combine my keywords as follows: (Cognitive behavioural therapy OR CBT) AND (anxiety) AND (adolescents OR youth). If you use terminologies unknown in your discipline, you will likely not find relevant studies for review.

Step 5: Plan and perform systematic review database selection

At this stage, you identify the databases you’ll use to execute your search strategy. When writing a systematic review dissertation, you also need to report the databases that you searched. Commonly searched ones in the field of social and health sciences include PubMed, Google Scholar, Cochrane, PsycInfo, and many others. You need to know how each database works. Also, apart from Google Scholar and PubMed, most of these databases require paid or institutional access. Liaise with your supervisor or librarian to help in identifying good databases for subject and discipline.

Step 6: Perform systematic review screening using titles and abstracts

When you execute your search strategy on each database, results or search hits will be displayed. This is also another difficult step because of tedious work involved. You start by screening the titles. Then, eliminate results that contain irrelevant titles. You need to be careful at this point because sometimes people eliminate even relevant studies. The title doesn’t need to contain exactly your keywords. Some titles appear totally irrelevant but they actually contain useful data inside.

After screening titles, the next step is to screen abstracts. You may be surprised at this point that the titles you thought were irrelevant actually contain relevant information. For instance, some studies may indicate in the title that their study focused on depression as an outcome when you’re interested in anxiety. However, reading the abstract may surprise you that depression was only a primary outcome. The authors also measured secondary outcomes, among them anxiety. In such an article, you can decide to focus on anxiety results only because they are relevant to your study.

Step 7: Do a manual search to supplement database search

After screening articles identified using various databases, the next step is to augment the search strategy with a manual search. This will ensure you don’t miss relevant studies in your systematic review dissertation. The manual search involves identifying more studies in the bibliographies of the identified articles using a database search. It is also about contacting the authors and experts sourced from the found articles to give access to more articles that may not be found online. Finally, you can also identify key journals from the articles and perform a hand search. For example, suppose I identify the Journal of Cognitive Psychology. In that case, I will visit that journal’s website and perform a manual search there. A properly done manual search can help you identify more articles that you couldn’t have identified using databases only.

Step 8: Perform systematic review screening using the full-body texts

After having all your articles intact, the next step is to screen for full-text bodies. In most cases, the titles and abstracts may not contain enough information for screening purposes. You must read the full texts of the articles to determine their full eligibility. At this point, you screen articles identified through database search and manual search altogether. For example, sometimes you may be interested in healthy adolescents. In the abstract, the author of the articles may only report adolescents without providing any specifics about them. Upon reading the full text, you may discover that the authors included adolescents with mental issues that are not within your study’s scope. Therefore, always do a full-text screening before you move to the next step.

Step 9: Perform systematic review quality assessment using PRISMA, etc

Systematic review dissertations can be used to inform the formulation of practice guidelines and even inform policies. You must strive to review only studies with rigorous methodological quality. The quality assessment tool will depend on your study’s design. The commonly used ones for student dissertations include CASP Checklists and Joanna Briggs Institute (JBI) Checklists. You can consult with your supervisor before arriving at the final decision. Transparently report your quality assessment findings. For example, indicate the score of each study under each item of each tool and calculate the overall score in the form of a percentage. Also, always have a cut-off of 65%, and studies whose methodological rigour is below the cut-off are excluded.

Step 10: Perform systematic review data extraction

The next step is to extract relevant data from your studies. Your data extraction approach depends on the research design of the studies you used. If you use qualitative studies, your data extraction can focus on individual studies’ findings, particularly themes. You can also extract data that can aid in-depth analysis, such as country of study, population characteristics, etc. Using quantitative studies, you can collect quantitative data that will aid your analysis, such as means and standard deviations and other crucial information relevant to your analysis technique. Always chart your data in a tabular format to facilitate easy management and handling.

Step 11: Carry on with systematic review data analysis

The data analysis approach used in your systematic review dissertation will depend on the research design. Using qualitative studies, you will rely on qualitative approaches to analyse your data. For example, you can do a thematic analysis or a narrative synthesis. If you used quantitative studies, you might need to perform a meta-analysis or narrative synthesis. A meta-analysis is done when you have homogenous studies (such as population, outcome variables, measurement tools, etc.) that are experimental in nature. Particularly, meta-analysis is performed when reviewing controlled randomized trials or other interventional studies. In other words, meta-analysis is appropriately used when reviewing the effectiveness of interventions. However, if your quantitative studies are heterogenous, such as using different research designs, you must perform a narrative synthesis.

Step 12: Prepare the written report

The final step is to produce a written report of your systematic review dissertation. One of the ethical concerns in systematic reviews is transparency. You can improve the transparency of your reporting by using an established protocol like PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses).

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Open access
Published: 12 December 2017

Acceptance of a systematic review as a thesis: survey of biomedical doctoral programs in Europe

Livia Puljak ORCID: orcid.org/0000-0002-8467-6061 1 , 2 , 3 &
Damir Sapunar 3

Systematic Reviews volume 6 , Article number: 253 ( 2017 ) Cite this article

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Systematic reviews (SRs) have been proposed as a type of research methodology that should be acceptable for a graduate research thesis. The aim of this study was to analyse whether PhD theses in European biomedical graduate programs can be partly or entirely based on SRs.

In 2016, we surveyed individuals in charge of European PhD programs from 105 institutions. The survey asked about acceptance of SRs as the partial or entire basis for a PhD thesis, their attitude towards such a model for PhD theses, and their knowledge about SR methodology.

We received responses from 86 individuals running PhD programs in 68 institutions (institutional response rate of 65%). In 47% of the programs, SRs were an acceptable study design for a PhD thesis. However, only 20% of participants expressed a personal opinion that SRs meet the criteria for a PhD thesis. The most common reasons for not accepting SRs as the basis for PhD theses were that SRs are ‘not a result of a PhD candidate’s independent work, but more of a team effort’ and that SRs ‘do not produce enough new knowledge for a dissertation’. The majority of participants were not familiar with basic concepts related to SRs; questions about meta-analyses and the type of plots frequently used in SRs were correctly answered by only one third of the participants.

Conclusions

Raising awareness about the importance of SRs and their methodology could contribute to higher acceptance of SRs as a type of research that forms the basis of a PhD thesis.

Peer Review reports

Systematic reviews (SRs) are a type of secondary research, which refers to the analysis of data that have already been collected through primary research [ 1 ]. Even though SRs are a secondary type of research, a SR needs to start with a clearly defined research question and must follow rigorous research methodology, including definition of the study design a priori, data collection, appraisal of study quality, numerical analyses in the form of meta-analyses and other analyses when relevant and formulation of results and conclusions. Aveyard and Sharp defined SRs as ‘original empirical research’ because they ‘review, evaluate and synthesise all the available primary data, which can be either quantitative or qualitative’ [ 2 ]. Therefore, a SR represents a new research contribution to society and is considered the highest level in the hierarchy of evidence in medicine [ 3 ].

SRs have been proposed as a type of research methodology that should be acceptable as the basis for a graduate research thesis [ 4 , 5 ]. To the best of our knowledge, there are no reports on the acceptance of SRs as the basis for PhD theses. A recent review addressed potential advantages and disadvantages of such a thesis type and presented opposing arguments about the issue [ 5 ]. However, there were no actual data that would indicate how prevalent one opinion is over another with regard to the acceptance of a SR as the primary research methodology for a PhD thesis. The aim of this cross-sectional study was to assess whether a PhD thesis in European biomedical graduate programs can be partly or entirely based on a SR, as well as to explore the attitudes and knowledge of individuals in charge of PhD programs with regard to a thesis of this type.

Participants

The Organization of PhD Education in Biomedicine and Health Sciences in the European System (ORPHEUS) includes 105 institutional members from 40 countries and six associate members from Canada, Georgia, Iran, Kyrgyzstan, Kazakhstan and the USA [ 6 ]. The ORPHEUS encompasses a network of higher education institutions committed to developing and disseminating best practice within PhD training programs in biomedicine, health sciences and public health. ORPHEUS approved the use of their mailing list for the purpose of this study. The mailing list had 1049 contacts. The study authors were not given the mailing list due to data protection and privacy. Instead, it was agreed that ORPHEUS officials would send the survey via email to the mailing list. The General Secretary of the ORPHEUS contacted individuals responsible for PhD programs (directors or deputy directors) among the institutional members, via e-mail, on 5th of July 2016. These individuals were sent an invitation to complete an online survey about SRs as the basis for PhD theses. We invited only individuals responsible for PhD programs (e.g., directors, deputy directors, head of graduate school, vice deans for graduate school or similar). We also asked them to communicate with other individuals in charge of their program to make sure that only one person per PhD program filled out the survey. If there were several PhD programs within one institution, we asked for participation of one senior person per program.

The survey was administered via Survey Monkey (Portland, OR, USA). The survey took 5–10 min to complete. One reminder was sent to the targeted participants 1 month after the first mail.

The ethics committee of the University of Split School of Medicine approved this study, which formed part of the Croatian Science Foundation grant no. IP-2014-09-7672 ‘Professionalism in Health Care’.

Questionnaire

The 20-item questionnaire, designed specifically for this study by both authors (LP and DS), was first tested for face validity and clarity among five individuals in charge of PhD programs. The questionnaire was then modified according to their feedback. The questionnaire included questions about their PhD program; whether PhD candidates are required to publish manuscript(s) before thesis defence; the minimum number of required manuscripts for defending a PhD thesis; the authorship requirements for a PhD candidate with regard to published manuscript(s); whether there is a requirement for a PhD candidate to publish manuscript(s) in journals indexed in certain databases or journals of certain quality, and how the quality is defined; the description about other requirements for defending a PhD thesis; whether a SR partly or fully meets requirements for approval of a PhD thesis in their graduate program; what are the rules related to the use of a SR as the basis for a PhD thesis; and the number of PhD theses based on SRs relative to other types of research methods.

Participants were also asked about their opinion with regard to the main reasons that SRs are not recognised in some institutions as the basis for a doctoral dissertation, and their opinion about literature reviews, using a four-item Likert scale, ranging from ‘agree’ to ‘disagree’, including an option for ‘don’t know’. In the last question, the participants’ knowledge about SR methodology was examined using nine statements; participants had to rate each statement as either ‘correct’, ‘incorrect’, ‘unsure’ or ‘I don’t know’. Finally, participants were invited to leave their email address if they wanted to receive survey results. The survey sent to the study participants can be found in an additional file (Additional file 1 ).

Data analysis

Survey responses were entered into a spreadsheet, checked by both authors and analysed using Microsoft Excel (Microsoft Inc., Redmond, WA, USA). Descriptive data are presented as frequencies and percentages. All raw data and analysed data sets used in the manuscript are available from authors on request. A point-biserial correlation (SPSS, IBM, Chicago, IL, USA) was used to measure the strength of the association between results on the knowledge test (continuous variable) and the attitude towards SRs as the basis for dissertations (dichotomous variable; we used the answer to the following question as this measure: ‘Do you agree that a systematic review, in whole or in part, meets the criteria for a publication on which a doctoral dissertation can be based?’).

Study participants

There are 105 institutions included in the ORPHEUS network. We received a response from 86 individuals representing 68 institutions from 37 countries (65% institutional response rate). There were more respondents than institutions because some institutions have several PhD programs and thus several program directors. Those responders were used as a unit of analysis in the analysis of attitudes and knowledge; institutions were the unit of analysis when analysing criteria for theses. Some of the questionnaires ( n = 15) were only partly completed. In most cases, the missing data were related to knowledge about SR methodology.

Overview of requirements for a dissertation

Based on the information provided by the graduate program directors, in the majority of the included PhD programs, students were required to publish a research manuscript prepared within their PhD thesis prior to their thesis defence (83%; n = 64). Among 13 programs (17%) that did not have this requirement, five respondents (38%) indicated that in their opinion their school’s rules related to a PhD thesis should be changed such as to specify that each thesis should be based on work that is already published in a journal.

The minimum number of published manuscripts necessary for the PhD thesis defence was prespecified in 94% ( n = 60) of the programs that required publication of research manuscripts prior to the thesis defence. In most of the programs (37%; n = 22), the number of required manuscripts was three or more. Two manuscripts were required in 30% ( n = 18) and one was required in 33% ( n = 20) of the programs. In four programs, there was no formal policy on this matter, but there was a strong expectation that the student will have contributed substantially to several manuscripts in peer-reviewed journals.

In most cases, the PhD candidates’ contribution to published manuscripts within the PhD thesis was determined through first authorship. A requirement that a PhD candidate should be the first author on a manuscript(s) that constitutes a PhD thesis was reported in 82% ( n = 64) of the graduate programs.

In 60% ( n = 52) of the graduate programs, the quality of the journals where a PhD candidate has to publish research manuscripts as a part of a PhD thesis was defined by the database in which these journals are indexed. The most commonly specified databases were Web of Science (41%; n = 35) and MEDLINE/PubMed (13%; n = 11), followed by Science Citation Index, Scopus, Current Contents, a combination of several databases or, in two cases, a combination of journals from a list defined by some governing body.

Systematic reviews as a PhD thesis

SRs, in whole or in part, met the criteria for acceptable research methodology for a PhD thesis in 47% ( n = 40) of programs, whereas 53% ( n = 46) of programs specifically stated that they did not accept SRs in this context (Fig. 1 a, b). Among the programs that accepted SRs, theses could be exclusively based on a SR in 42% ( n = 17) of programs, while in the remaining programs, SRs were acceptable as one publication among others in a dissertation.

a European PhD programs that recognise a systematic review as a PhD thesis (green dot) and those that do not (red dot). Half red and half green dots indicate the five universities with institutions that have opposite rules regarding recognition of a systematic review as a PhD thesis. The pie chart presents b the percentage of the programs in which systematic reviews, in whole or in part, meet the criteria for a dissertation and c the opinion of participants about whether systematic reviews should form the basis of a publication within a PhD dissertation

The majority of participants (80%; n = 69) indicated that SRs did not meet criteria for a publication on which a PhD dissertation should be based (Fig. 1 c). The main arguments for not recognising a SR as the basis for a PhD thesis are listed in Table 1 . The majority of respondents were neutral regarding the idea that scoping reviews or SRs should replace traditional narrative reviews preceding the results of clinical and basic studies in doctoral theses. Most of the respondents agreed that narrative or critical/discursive literature reviews preceding clinical studies planned as part of a dissertation should be replaced with systematic reviews (Table 2 ).

Most of the programs that accepted SRs as a research methodology acceptable for PhD theses had defined rules related to the use of an SR as part of a PhD thesis (Fig. 2 ). The most common rule was that a SR can be one publication among others within a PhD thesis. Some of the respondents indicated that empty (reviews that did not find a single study that should be included after literature search) or updated reviews could also be used for a PhD thesis (Fig. 2 ).

Frequency of different rules that define the use of systematic reviews as a part of a PhD thesis in European biomedical graduate programs

The results of the survey regarding knowledge about SR methodology indicated that the majority of respondents were not familiar with this methodology. Only three out of nine questions were correctly answered by more than 80% of the participants, and questions about meta-analyses and the type of plots frequently used in a SR were correctly answered by only one third of the participants (Table 3 ). The association between participants’ results on the knowledge test and attitudes towards SRs was tested using a point-biserial correlation; this revealed that lack of knowledge was not correlated with negative attitudes towards SRs ( r pb = 0.011; P = 0.94).

In this study conducted among individuals in charge of biomedical graduate programs in Europe, we found that 47% of programs accepted SRs as research methodology that can partly or fully fulfil the criteria for a PhD thesis. However, most of the participants had negative attitudes about such a model for a PhD thesis, and most had insufficient knowledge about the basic aspects of SR methodology. These negative attitudes and lack of knowledge likely contribute to low acceptance of SRs as an acceptable study design to include in a PhD thesis.

A limitation of this study was that we relied on participants’ responses and not on assessments of formal rules of PhD programs. Due to a lack of familiarity with SRs, it is possible that the respondents gave incorrect answers. We believe that this might be the case since we received answers from different programs in the same university, where one person claimed that SRs were accepted in their program, and the other person claimed that they were not accepted in the other program. We had five such cases, so it is possible that institutions within the same university have different rules related to accepted research methodology in graduate PhD programs. This study may not be generalisable to different PhD programs worldwide that were not surveyed. The study is also not generalisable to Europe, as there are no universal criteria or expectations for PhD theses in Europe. Even in the same country, there may be different models and expectations for a PhD in different higher education institutions.

A recent study indicated a number of opposing views and disadvantages related to SRs as research methodology for graduate theses, including lack of knowledge and understanding by potential supervisors, which may prevent them from being mentors and assisting students to complete such a study [ 5 ]. This same manuscript emphasised that there may be constraints if the study is conducted in a resource-limited environment without access to electronic databases, that there may be a very high or very low number of relevant studies that can impact the review process, that methods may not be well developed for certain types of research syntheses and that it may be difficult to publish SRs [ 5 ].

Some individuals believe that a SR is not original research. Indeed, it has been suggested that SRs as ‘secondary research’ are different than ‘primary or original research’, implying that they are inferior and lacking in novelty and methodological rigour as compared to studies that are considered primary research. In 1995, Feinstein suggested that such studies are ‘statistical alchemy for the 21st century’ and that a meta-analysis removes or destructs ‘scientific requirements that have been so carefully developed and established during the 19th and 20th centuries’ [ 7 ]. There is little research about this methodological issue. Meerpohl et al. surveyed journal editors and asked whether they consider SRs to be original studies. The majority of the editors indicated that they do think that SRs are original scientific contributions (71%) and almost all journals (93%) published SRs. That study also highlighted that the definition of original research may be a grey area [ 8 ]. They argued that, in an ideal situation, ‘the research community would accept systematic reviews as a research category of its own, which is defined by methodological criteria, as is the case for other types of research’ [ 8 ]. Biondi-Zoccai et al. pointed out that the main criteria to judge a SR should be its novelty and usefulness, and not whether it is original/primary or secondary research [ 9 ].

In our study, 80% of the participants reported negative attitudes, and more than half of the respondents agreed with a statement that SRs are ‘not a result of the candidate’s independent work since systematic reviews tend to be conducted by a team’. This opinion is surprising since other types of research are also conducted within a team, and single authorship is very rare in publications that are published within a PhD thesis. On the contrary, the mean number of authors of research manuscripts is continuously increasing [ 10 ]. At the very least, the authors of manuscripts within a PhD will include the PhD candidate and a mentor, which is a team in and of itself. Therefore, it is unclear why somebody would consider it a problem that a SR is conducted within a team.

The second most commonly chosen argument against such a thesis was that SRs ‘do not produce enough new knowledge for a dissertation’. The volume of a SR largely depends on the number of included studies and the available data for numerical analyses. Therefore, it is unfair to label a SR as a priori lacking in new knowledge. There are SRs with tens or hundreds of included studies, and some of them not only include meta-analyses, but also network meta-analyses, which are highly sophisticated statistical methods. However, limiting SRs within a thesis only to those with meta-analysis would be unfair because sometimes meta-analysis is not justified due to clinical or statistical heterogeneity [ 11 ] and the presence or absence of a meta-analysis is not an indicator of the quality of a SR. Instead, there are relevant checklists for appraising methodological and reporting quality of a SR [ 12 , 13 ].

The third most commonly chosen argument against SRs within PhD theses was ‘lack of adequate training of candidates in methodology of systematic reviews’. This could refer to either insufficient formal training or insufficient mentoring. The graduate program and the mentor need to ensure that a PhD candidate receives sufficient knowledge to complete the proposed thesis topic. Successful mentoring in academic medicine requires not only commitment and interpersonal skills from both the mentor and mentee, but also a facilitating institutional environment [ 14 ]. This finding could be a result of a lack of capacity and knowledge for conducting SRs in the particular institutions where the survey was conducted, and not general opinion related to learning a research method when conducting a PhD study. Formal training in skills related to SRs and research synthesis methods [ 15 , 16 ], as well as establishing research collaborations with researchers experienced in this methodology, could alleviate this concern.

One third of the participants indicated a ‘lack of appreciation of systematic review methodology among faculty members’ as a reason against such a thesis model. This argument, as well as the prevalent negative attitude towards SRs as PhD theses, perhaps can be traced to a lack of knowledge about SR methodology; however, although the level of knowledge was quite low in our study, there was no statistically significant correlation between knowledge and negative attitudes. Of the nine questions about SR research methodology, only three questions were correctly answered by more than half of the participants. This could be a cause for concern because it has been argued that any health research should begin with a SR of the literature [ 17 ]. It has also been argued that the absence of SRs in the context of research training might severely hamper research trainees and may negatively impact the research conducted [ 18 ]. Thus, it has been recommended that SRs should be included ‘whenever appropriate, as a mandatory part of any PhD program or candidature’ [ 18 ].

It has recently been suggested that the overwhelming majority of investment in research represents an ‘avoidable waste’ [ 19 ]. Research that is not necessary harms both the public and patients, because funds are not invested where they are really necessary, and necessary research may not be conducted [ 17 ]. This is valid not only for clinical trials, but also for other types of animal and human experiments [ 20 ]. SRs can help improve the design of new experiments by relying on current evidence in the field and by helping to clarify which questions still need to be addressed. SRs can be instrumental in improving methodological quality of new experiments, providing evidence-based recommendations for research models, reducing avoidable waste, and enabling evidence-based translational research [ 20 ].

Four respondents from three institutions indicated that empty SRs are accepted as a PhD thesis. While it makes sense to include such a SR as a part of the thesis to indicate lack of evidence in a certain field, it is highly unlikely that an entire thesis can be based on an empty SR, without a single included study.

There are many advantages of a SR as a graduate thesis [ 4 , 5 ], especially as a research methodology suitable for low-resource settings. A PhD candidate can prepare a Cochrane SR as a part of the PhD thesis, yielding a high-impact publication [ 4 ]. Non-Cochrane SRs can also be published in high-impact journals. A PhD candidate involved in producing a SR within a PhD thesis goes through the same research process as those conducting primary research, from setting up a hypothesis and a research question, to development of a protocol, data collection, data analysis and appraisal, and formulation of conclusions. Graduate programs can set limits, such as the prevention of empty reviews and the recognition of updated reviews as valid for a PhD thesis, and engage experienced researchers as advisors and within thesis evaluation committees, to ensure that a candidate will conduct a high-quality SR [ 4 ]. Conducting a SR should not be mandatory, but candidates and mentors willing to produce such research within a graduate program should be allowed to do so.

Further studies in this field could provide better insight into attitudes related to SRs as graduate theses and explore interventions that can be used to change negative attitudes and improve knowledge of SRs among decision-makers in graduate education.

Raising awareness about the importance of SRs in biomedicine, the basic aspects of SR methodology and the status of SRs as original secondary research could contribute to greater acceptance of SRs as potential PhD theses. Our results can be used to create strategies that will enhance acceptance of SRs among graduate education program directors.

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Acknowledgements

The authors thank the ORPHEUS secretariat for administering the survey and the study participants for taking time to participate in the survey. We are grateful to Prof. Ana Marušić for the critical reading of the manuscript.

This research was funded by the Croatian Science Foundation, grant no. IP-2014-09-7672 ‘Professionalism in Health Care’. The funder had no role in the design of this study or its execution and data interpretation.

Availability of data and materials

The datasets used and/or analysed for the current study are available from the corresponding author on reasonable request.

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Cochrane Croatia, University of Split School of Medicine, Šoltanska 2, 21000, Split, Croatia

Livia Puljak

Department for Development, Research and Health Technology Assessment, Agency for Quality and Accreditation in Health Care and Social Welfare, Planinska 13, 10000, Zagreb, Croatia

Laboratory for Pain Research, University of Split School of Medicine, Šoltanska 2, 21000, Split, Croatia

Livia Puljak & Damir Sapunar

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Contributions

Both authors participated in the study design, data collection and analysis and writing of the manuscript, and both read and approved the final manuscript.

Corresponding author

Correspondence to Livia Puljak .

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The Ethics Committee of the University of Split School of Medicine approved the study. All respondents consented to participate in the study.

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Additional file

Additional file 1:.

Online survey used in the study. Full online survey that was sent to the study participants. (PDF 293 kb)

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Puljak, L., Sapunar, D. Acceptance of a systematic review as a thesis: survey of biomedical doctoral programs in Europe. Syst Rev 6 , 253 (2017). https://doi.org/10.1186/s13643-017-0653-x

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Dissertation examples

Listed below are some of the best examples of research projects and dissertations from undergraduate and taught postgraduate students at the University of Leeds We have not been able to gather examples from all schools. The module requirements for research projects may have changed since these examples were written. Refer to your module guidelines to make sure that you address all of the current assessment criteria. Some of the examples below are only available to access on campus.

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These dissertations achieved a mark of 80 or higher:
The following two examples have been annotated with academic comments. This is to help you understand why they achieved a good 2:1 mark but also, more importantly, how the marks could have been improved. Please read to help you make the most of the two examples. (Mark 68) (Mark 66) These final year projects achieved a mark of a high first: For students undertaking a New Venture Creation (NVC) approach, please see the following Masters level examples:


Projects which attained grades of over 70 or between 60 and 69 are indicated on the lists (accessible only by students and staff registered with School of Computer Science, when on campus).
These are good quality reports but they are not perfect. You may be able to identify areas for improvement (for example, structure, content, clarity, standard of written English, referencing or presentation quality).

The following examples have their marks and feedback included at the end of of each document. The following examples have their feedback provided in a separate document.

School of Media and Communication .

The following outstanding dissertation example PDFs have their marks denoted in brackets. (Mark 78) (Mark 72) (Mark 75) (Mark 91) (Mark 85) (Mark 85) (Mark 85) (Mark 91) (Mark 85) (Mark 75)
This dissertation achieved a mark of 84: .

These dissertations achieved a mark of 80 or higher:

The following two examples have been annotated with academic comments. This is to help you understand why they achieved a good 2:1 mark but also, more importantly, how the marks could have been improved.

Please read to help you make the most of the two examples.

(Mark 68)

(Mark 66)

These final year projects achieved a mark of a high first:

For students undertaking a New Venture Creation (NVC) approach, please see the following Masters level examples:

Projects which attained grades of over 70 or between 60 and 69 are indicated on the lists (accessible only by students and staff registered with School of Computer Science, when on campus).

These are good quality reports but they are not perfect. You may be able to identify areas for improvement (for example, structure, content, clarity, standard of written English, referencing or presentation quality).

The following examples have their marks and feedback included at the end of of each document.

The following examples have their feedback provided in a separate document.

School of Media and Communication .

The following outstanding dissertation example PDFs have their marks denoted in brackets.

(Mark 78)
(Mark 72)
(Mark 75)

(Mark 91)
(Mark 85)
(Mark 85)
(Mark 85)
(Mark 91)

(Mark 85)
(Mark 75)

This dissertation achieved a mark of 84:


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The following outstanding dissertation example PDFs have their marks denoted in brackets. (Mark 70) (Mark 78)

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The following outstanding dissertation example PDFs have their marks denoted in brackets.

(Mark 70)

(Mark 78)

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What is different about dissertation research?

Where should i start, what is a literature review, why are literature reviews important, what is a literature search, should i conduct a ‘systematic review’, can i get help with researching my dissertation.

The research process for your dissertation requires a different approach from that you'll have used during your taught modules. Rather than being guided to relevant sources by a lecturer, you’re responsible for finding, selecting, evaluating and managing all your research sources. You'll be using many more sources than you'll have consulted for smaller pieces of assessed work, and perhaps different types of information from those you've used previously, so you need to think carefully about your approach to your information gathering and management activities.

If you're unsure where to start, then some background reading should help you get underway. Start by looking at broad themes and topics of interest, viewing sources like textbooks, subject dictionaries and encyclopaedias which examine larger fundamental concepts, before narrowing your search to look for specific research in your area of study. If you find some really useful material, such as relevant articles or books, you can mine these for all sorts of other useful related sources. For example:

Has the author written additional material on the topic?
Does the work have useful keywords or subject terms you can use for further research?
Does the work have references or a bibliography you can use to explore related material?

A literature review summarises and analyses the literature you've found through your research. In a literature review, the literature itself is the subject of discussion. The aim of a literature review is to demonstrate that you’ve read, and have a good grasp of, the main published material concerning a particular topic or question in your field. A literature review isn’t a straightforward summary of everything you’ve read on a topic. It’s an evaluative analysis of what’s been discovered in your field. The review should describe, summarise, evaluate and clarify this literature. Research and Writing Skills for Dissertations and Projects is a UCL Moodle course available to all UCL students and looks at the skills associated with researching and writing an extended piece of work. Module 4 focuses on the literature review process.

When academics and industry professionals conduct research, they usually publish the work in books, journal articles and conference proceedings. For the most part, this is the 'literature' you need to find and review. A literature review sets the scene for your work. It places your research in context and shows how it relates to and builds upon the work of others. It’s also your chance to tell people why your work matters, why it’s relevant, and how it contributes original research to your field. Importantly, a literature review helps you find out how to do research. It shows which research methods have worked in the past and which ones haven’t. This can be a big help when planning your own research strategy.

For your dissertation, you’re likely to need to perform a literature search. A literature search is a well-thought-out, organised search and evaluation of literature available on a topic. A well-structured literature search is an effective and efficient way to locate sound evidence on the subject you're researching. 'Literature' can include journal articles, newspaper articles, official publications, conference proceedings, archives, book chapters, etc. View the literature searching page on this guide for further details about planning your search, common search techniques and developing a search strategy.

Systematic reviews are a type of literature review that follow a very rigorous and systematic searching, screening and analysis process. You can find out more about the process on our guide to systematic reviews . Usually a systematic review addresses a focused, structured research question to inform understanding on a particular topic and often to support evidence-based decision-making in that area. To do a full systematic review can be an extremely time-consuming process and requires a lot of resources, but you may want to incorporate some similar methodology, such as systematic approaches to literature searching or data analysis, without necessarily carrying out a full review. This can be considered to be a systematic style review, or a “light” systematic review.

Your Subject Liaison Librarian or Site Library can provide support for your dissertation through their subject guides which offer guidance on accessing quality academic resources. Send them an email for personalised support or book a one-to-one appointment .

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Undergraduate dissertations are not available in the library. We are currently working on selecting and digitising a selection of USW undergraduate dissertations.

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COMMENTS

Examples of systematic reviews
Please choose the tab below for your discipline to see relevant examples. For more information about how to conduct and write reviews, please see the Guidelines section of this guide. Vibration and bubbles: a systematic review of the effects of helicopter retrieval on injured divers. (2018). Nicotine effects on exercise performance and ...
A Systematic Review and Meta-Analysis of the Effectiveness of Child
a systematic review and meta-analysis of the effectiveness of child-parent interventions for children and adolescents with anxiety disorders a dissertation submitted to the faculty of the graduate school in candidacy for the degree of doctor of philosophy program in social work by kristen esposito brendel chicago, illinois may 2011
Chapter 1. Carrying Out a Systematic Review as a Master's Thesis
by Angela Boland, M. Gemma Cherry and Rumona Dickson. Chapter 1. Carrying Out a Systematic Review as a Master's Thesis. Explore the wealth of resources available across the web. Here are some good places to start. Link to the Campbell Collaboration, an organization that prepares, maintains and disseminates systematic reviews in education, crime ...
Chapter 1: Carrying Out a Systematic Review as a Master's Thesis
Doing a Systematic Review: A Student's Guide. by Angela Boland, M. Gemma Cherry and Rumona Dickson. Chapter 1: Carrying Out a Systematic Review as a Master's Thesis. What Is The Difference Between A Systematic Review And A Meta-Analysis?
Systematic Review
Systematic Review | Definition, Examples & Guide - Scribbr
PDF The systematic literature review process: a simple guide for public
review, they may have some confusion and doubt on the distinction between a traditional literature review and a systematic review. This paper aims to clarify what a systematic review entails and take the readers' attention through the practical steps in conducting a systematic review. So, more of a practical step-by-step guide, rather than ...
Systematic Review
Systematic Review | Definition, Example & Guide
PDF How to Write a Systematic Review: A Step-by-Step Guide
fined criteria in order to answer a research question. The quantitative combination and statistical synthesis of the systema. cally-collected data is what defines a meta-analysis. Here, we first attempt to delineate the basic steps for conducting a systematic review: initial planning, conduc.
PDF Systematic review template
The Campbell Collaboration was founded on the principle that systematic reviews on the effects of interventions will inform and help improve policy and services. Campbell offers editorial and methodological support to review authors throughout the process of producing a systematic review. A number of Campbell's editors,
(PDF) How to Do a Systematic Review: A Best Practice Guide for
Systematic reviews are characterized by a methodical and replicable methodology and presentation. They involve a comprehensive search to locate all relevant published and unpublished work on a ...
PDF Master'S Thesis a Systematic Literature Review on Agile Project ...
le project management (APM), the thesis uses a systematic literature review. Since managing projects in agile way is a relatively new concept compared to the traditional waterfall model, the resu. ts of the review provide an overview of the research conducted in this area. The results are expected t. he.
How to Do a Systematic Review: A Best Practice Guide for Conducting and
Systematic reviews are characterized by a methodical and replicable methodology and presentation. They involve a comprehensive search to locate all relevant published and unpublished work on a subject; a systematic integration of search results; and a critique of the extent, nature, and quality of evidence in relation to a particular research question.
How to Write a Systematic Review Dissertation: With Examples
Step 10: Perform systematic review data extraction. The next step is to extract relevant data from your studies. Your data extraction approach depends on the research design of the studies you used. If you use qualitative studies, your data extraction can focus on individual studies' findings, particularly themes.
PDF King's College London
This review therefore, is the first systematic review to consider mental health specifically, across the UK school-age population, with reference to the role of school nurses. A brief scoping study identified a gap in literature which provided the rationale for this systematic review and with resultant identified research questions.
PDF A Complete Dissertation
dissertation—that is,precursor of what is to come, with each element being more fully developed and explained fu. ther along in the book.For each key element, explain reason for inclusion, quality markers, and fr. OVERVIEWFRONT MATTERFollowing is a road map that briefly outlines the contents of. an enti.
Acceptance of a systematic review as a thesis: survey of biomedical
Background Systematic reviews (SRs) have been proposed as a type of research methodology that should be acceptable for a graduate research thesis. The aim of this study was to analyse whether PhD theses in European biomedical graduate programs can be partly or entirely based on SRs. Methods In 2016, we surveyed individuals in charge of European PhD programs from 105 institutions. The survey ...
PDF Guidelines for Systematic Reviews in the Context of Doctoral Education
dissertation, a systematic review could constitute one of three papers. In a traditional form dissertation, a systematic review may replace the literature review section. 2. The SR can be the methodological focus for candidacy exams (e.g. the student does not have a second methodological focus for candidacy). 3.
Dissertation examples
Dissertation examples. Listed below are some of the best examples of research projects and dissertations from undergraduate and taught postgraduate students at the University of Leeds We have not been able to gather examples from all schools. The module requirements for research projects may have changed since these examples were written.
Systematic Literature Review: Some Examples
Report. 4. ii. Example for a Systematic Literature Review: In references 5 example for paper that use Systematic Literature Review (SlR) example: ( Event-Driven Process Chain for Modeling and ...
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Systematic reviews are a type of literature review that follow a very rigorous and systematic searching, screening and analysis process. You can find out more about the process on our guide to systematic reviews. Usually a systematic review addresses a focused, structured research question to inform understanding on a particular topic and often to support evidence-based decision-making in that ...
PDF Writing an Effective Literature Review
he simplest thing of all—structure. Everything you write has three components: a beginning, a middle and an e. d and each serves a different purpose. In practice, this means your review will have an introduction, a main body where you review the literature an. a conclusion where you tie things up.
LibGuides: Literature Review: Examples of dissertations
You will find our postgraduate dissertations in our research repository USW Pure. Ask your supervisor if they have any good examples of past dissertations that you can have a look at. For reference, below are some examples of undergraduate dissertations from some other UK universities. Bristol University. Leeds University.
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Systematic Reviews

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Doing a Systematic Review: A Student's Guide

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Systematic Review | Definition, Examples & Guide

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Step 1: Formulate a research question

Step 2: Develop a protocol

Step 3: Search for all relevant studies

Step 4: Apply the selection criteria

Step 5: Extract the data

Step 6: Synthesise the data

Step 7: Write and publish a report

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Shaun Turney

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Systematic Review | Definition, Example & Guide

Table of contents

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Prevent plagiarism. Run a free check.

Step 1: Formulate a research question

Step 2: Develop a protocol

Step 3: Search for all relevant studies

Step 4: Apply the selection criteria

Step 5: Extract the data

Step 6: Synthesize the data

Step 7: Write and publish a report

Cite this Scribbr article

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Shaun Turney

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How to Do a Systematic Review: A Best Practice Guide for Conducting and Reporting Narrative Reviews, Meta-Analyses, and Meta-Syntheses

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How to Write a Systematic Review Dissertation: With Examples

Factors to Consider When Writing a Systematic Review Dissertation

Availability of primary studies

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Step-by-Step Process in Writing a Systematic Review Dissertation

Step 1: Formulate the systematic review research question

Step 2: Do a preliminary search

Step 3: Develop your systematic review inclusion and exclusion criteria

Step 4: Develop your systematic review search strategy

Step 5: Plan and perform systematic review database selection

Step 6: Perform systematic review screening using titles and abstracts

Step 7: Do a manual search to supplement database search

Step 8: Perform systematic review screening using the full-body texts

Step 9: Perform systematic review quality assessment using PRISMA, etc

Step 10: Perform systematic review data extraction

Step 11: Carry on with systematic review data analysis

Step 12: Prepare the written report

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Acceptance of a systematic review as a thesis: survey of biomedical doctoral programs in Europe

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Systematic reviews as a PhD thesis

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