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Methodology
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:
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 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.
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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.
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 systematic review has many pros .
Systematic reviews also have a few cons .
The 7 steps for conducting a systematic review are explained with an example.
Formulating the research question is probably the most important step of a systematic review. A clear research question will:
A good research question for a systematic review has four components, which you can remember with the acronym PICO :
You can rearrange these four components to write your research question:
Sometimes, you may want to include a fifth component, the type of study design . In this case, the acronym is PICOT .
Their research question was:
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:
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 .
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:
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 .
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:
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 .
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.
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:
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 randomized into the control and treatment groups.
Synthesizing the data means bringing together the information you collected into a single, cohesive story. There are two main approaches to synthesizing the data:
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 analyzed the effect sizes within each group.
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:
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.
Research 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.
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Definition: A literature review is a systematic examination and synthesis of existing scholarly research on a specific topic or subject.
Purpose: It serves to provide a comprehensive overview of the current state of knowledge within a particular field.
Analysis: Involves critically evaluating and summarizing key findings, methodologies, and debates found in academic literature.
Identifying Gaps: Aims to pinpoint areas where there is a lack of research or unresolved questions, highlighting opportunities for further investigation.
Contextualization: Enables researchers to understand how their work fits into the broader academic conversation and contributes to the existing body of knowledge.
tl;dr A literature review critically examines and synthesizes existing scholarly research and publications on a specific topic to provide a comprehensive understanding of the current state of knowledge in the field.
❌ An annotated bibliography
❌ Original research
❌ A summary
❌ Something to be conducted at the end of your research
❌ An opinion piece
❌ A chronological compilation of studies
The reason for conducting a literature review is to:
What has been written about your topic? What is the evidence for your topic? What methods, key concepts, and theories relate to your topic? Are there current gaps in knowledge or new questions to be asked? | |
Bring your reader up to date Further your reader's understanding of the topic | |
Provide evidence of... - your knowledge on the topic's theory - your understanding of the research process - your ability to critically evaluate and analyze information - that you're up to date on the literature |
While this 9-minute video from NCSU is geared toward graduate students, it is useful for anyone conducting a literature review.
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By Carol Hollier on 07-Jan-2020 12:42:03
For those not immersed in systematic reviews, understanding the difference between a systematic review and a systematic literature review can be confusing. It helps to realise that a “systematic review” is a clearly defined thing, but ambiguity creeps in around the phrase “systematic literature review” because people can and do use it in a variety of ways.
A systematic review is a research study of research studies. To qualify as a systematic review, a review needs to adhere to standards of transparency and reproducibility. It will use explicit methods to identify, select, appraise, and synthesise empirical results from different but similar studies. The study will be done in stages:
Some reviews also state what degree of confidence can be placed on that answer, using the GRADE scale. By going through these steps, a systematic review provides a broad evidence base on which to make decisions about medical interventions, regulatory policy, safety, or whatever question is analysed. By documenting each step explicitly, the review is not only reproducible, but can be updated as more evidence on the question is generated.
Sometimes when people talk about a “systematic literature review”, they are using the phrase interchangeably with “systematic review”. However, people can also use the phrase systematic literature review to refer to a literature review that is done in a fairly systematic way, but without the full rigor of a systematic review.
For instance, for a systematic review, reviewers would strive to locate relevant unpublished studies in grey literature and possibly by contacting researchers directly. Doing this is important for combatting publication bias, which is the tendency for studies with positive results to be published at a higher rate than studies with null results. It is easy to understand how this well-documented tendency can skew a review’s findings, but someone conducting a systematic literature review in the loose sense of the phrase might, for lack of resource or capacity, forgo that step.
Another difference might be in who is doing the research for the review. A systematic review is generally conducted by a team including an information professional for searches and a statistician for meta-analysis, along with subject experts. Team members independently evaluate the studies being considered for inclusion in the review and compare results, adjudicating any differences of opinion. In contrast, a systematic literature review might be conducted by one person.
Overall, while a systematic review must comply with set standards, you would expect any review called a systematic literature review to strive to be quite comprehensive. A systematic literature review would contrast with what is sometimes called a narrative or journalistic literature review, where the reviewer’s search strategy is not made explicit, and evidence may be cherry-picked to support an argument.
The patents indexed help find results of research not otherwise publicly available because it has been done for commercial purposes.
The FSTA thesaurus will surface results that would be missed with keyword searching alone. Since the thesaurus is designed for the sciences of food and health, it is the most comprehensive for the field.
All indexing and abstracting in FSTA is in English, so you can do your searching in English yet pick up non-English language results, and get those results translated if they meet the criteria for inclusion in a systematic review.
FSTA includes grey literature (conference proceedings) which can be difficult to find, but is important to include in comprehensive searches.
FSTA content has a deep archive. It goes back to 1969 for farm to fork research, and back to the late 1990s for food-related human nutrition literature—systematic reviews (and any literature review) should include not just the latest research but all relevant research on a question.
FSTA allows you to easily search for review articles (both narrative and systematic reviews) by using the subject heading or thesaurus term “REVIEWS" and an appropriate free-text keyword.
On the Web of Science or EBSCO platform, an FSTA search for reviews about cassava would look like this: DE "REVIEWS" AND cassava.
On the Ovid platform using the multi-field search option, the search would look like this: reviews.sh. AND cassava.af.
In 2011 FSTA introduced the descriptor META-ANALYSIS, making it easy to search specifically for systematic reviews that include a meta-analysis published from that year onwards.
On the EBSCO or Web of Science platform, an FSTA search for systematic reviews with meta-analyses about staphylococcus aureus would look like this: DE "META-ANALYSIS" AND staphylococcus aureus.
On the Ovid platform using the multi-field search option, the search would look like this: meta-analysis.sh. AND staphylococcus aureus.af.
Systematic reviews with meta-analyses published before 2011 are included in the REVIEWS controlled vocabulary term in the thesaurus.
An easy way to locate pre-2011 systematic reviews with meta-analyses is to search the subject heading or thesaurus term "REVIEWS" AND meta-analysis as a free-text keyword AND another appropriate free-text keyword.
On the Web of Science or EBSCO platform, the FSTA search would look like this: DE "REVIEWS" AND meta-analysis AND carbohydrate*
On the Ovid platform using the multi-field search option, the search would look like this: reviews .s h. AND meta-analysis.af. AND carbohydrate*.af.
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Educational resources and simple solutions for your research journey
Most budding researchers are confused between systematic review vs. literature review. As a PhD student or early career researcher, you must by now be well versed with the fact that literature review is the most important aspect of any scientific research, without which a study cannot be commenced. However, literature review is in itself an ‘umbrella term’, and there are several types of reviews, such as systematic literature reviews , that you may need to perform during your academic publishing journey, based upon their specific relevance to each study.
Your research goal, approach, and design will finally influence your choice of systematic review vs literature review . Apart from systematic literature review , some other common types of literature review are 1 :
The most commonly used form of review, however, is the systematic literature review . Compared to the other types of literature reviews described above, this one requires a more rigorous and well-defined approach. The systematic literature review can be divided into two main categories: meta-analysis and meta-synthesis. Meta-analysis is related to identifying patterns and relationships within the data, by using statistical procedures. Meta-synthesis on the other hand, is concerned with integrating findings of multiple qualitative research studies, not necessarily needing statistical procedures.
Table of Contents
In spite of having this basic understanding, however, there might still be a lot of confusion when it comes to finalizing between a systematic review vs literature review of any other kind. Since these two types of reviews serve a similar purpose, they are often used interchangeably and the difference between systematic review and literature review is overlooked. In order to ease this confusion and smoothen the process of decision-making it is essential to have a closer look at a systematic review vs. literature review and the differences between them 2.3 :
Goal | Provides answers to a focused question, most often a clinical question | Provides a general overview regarding any particular topic or concept
|
Methodology | Pre-specified methods, may or may not include statistical analysis, but methods are usually reproducible. The results and conclusion are usually evidence-based.
| Methods are not as rigorous, do not have inclusion and exclusion criteria and may follow a thematic approach. The conclusions may be subjective and qualitative, based upon the individual author’s perspective of the data.
|
Content
| The main components of the systematic literature review include: Prespecified criteria, search strategy, assessment of the validity of the findings, interpretation and presentation of the results, and references.
| The main components of this review include: Introduction, methods, discussion, conclusion, and references. |
Author limit
| Three or more | One or more |
Value | Valuable for clinicians, experts, and practitioners who are looking for evidence-based data.
| Valuable for a broader group of researchers and scientists who are looking to summarize and understand a particular topic in depth
|
While the above illustrated similarities and differences between systematic review and literature review might be helpful as an overview, here are some additional pointers that you can keep in mind while performing a review for your research study 4 :
We hope that the above article was helpful for you in understanding the basics of literature review and to know the use of systemic review vs. literature review.
Q: When to do a systematic review?
A systematic review is conducted to synthesize and analyze existing research on a specific question. It’s valuable when a comprehensive assessment of available evidence is required to answer a well-defined research question. Systematic reviews follow a predefined protocol, rigorous methodology, and aim to minimize bias. They’re especially useful for informing evidence-based decisions in healthcare and policy-making.
Q: When to do a literature review?
A literature review surveys existing literature on a topic, providing an overview of key concepts and findings. It’s conducted when exploring a subject, identifying gaps, and contextualizing research. Literature reviews are valuable at the beginning of a study to establish the research landscape and justify the need for new research.
Q: What is the difference between a literature review and a scoping review?
A literature review summarizes existing research on a topic, while a scoping review maps the literature to identify research gaps and areas for further investigation. While both assess existing literature, a scoping review tends to have broader inclusion criteria and aims to provide an overview of the available research, helping researchers understand the breadth of a topic before narrowing down a research question.
Q: What’ is the difference between systematic Literature Review and Meta Analysis?
A systematic literature review aims to comprehensively identify, select, and analyze all relevant studies on a specific research question using a rigorous methodology. It summarizes findings qualitatively. On the other hand, a meta-analysis is a statistical technique applied within a systematic review. It involves pooling and analyzing quantitative data from multiple studies to provide a more precise estimate of an effect size. In essence, a meta-analysis is a quantitative synthesis that goes beyond the qualitative summary of a systematic literature review.
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Literature reviews are a main part of the research process. Literature Reviews can be stand-alone research projects, or they can be part of a larger research study. In both cases, literature reviews must follow specific guidelines so they can meet the rigorous requirements for being classified as a scientific contribution. More importantly, these reviews must be transparent so that they can be replicated or reproduced if desired. The rigorous requirements set out by the National Science Foundation (NSF) and the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) aim to support researchers in conducting literature reviews as well as address the replication crisis that has challenged scientific disciplines over the past decade. The current chapter identifies some of the requirements along with highlighting different types of reviews and recommendations for conducting a rigorous review.
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Begley GC, Ioannidis JPA (2015) Reproducibility in science: improving the standard for basic and preclinical research. Circ Res 116:116–126. https://doi.org/10.1161/CIRCRESAHA.114.303819
Article CAS PubMed Google Scholar
Romero F (2019) Philosophy of science and the replicability crisis. Philos Compass 14:e12633. https://doi.org/10.1111/phc3.12633
Article Google Scholar
Van Bavel JJ, Mende-Siedlecki P, Brady WJ, Reinero DA (2016) Contextual sensitivity in scientific reproducibility. Proc Natl Acad Sci U S A 113:6454–6459. https://doi.org/10.1073/pnas.1521897113
Article CAS PubMed PubMed Central Google Scholar
Ioannidis JPA (2012) Why science is not necessarily self-correcting. Perspect Psychol Sci 7:645–654. https://doi.org/10.1177/1745691612464056
Article PubMed Google Scholar
Bollen K, Cacioppo JT, Kaplan RM, Krosnick JA, Olds JL (2015) Social, behavioral, and economic sciences perspectives on robust and reliable science. https://www.nsf.gov/sbe/AC_Materials/SBE_Robust_and_Reliable_Research_Report.pdf . Accessed 15 Sept 2022
Page MJ, McKenzie JE, Bossuyt PM, Boutron I, Hoffmann TC, Mulrow CD et al (2021) The PRISMA 2020 statement: an updated guideline for reporting systematic reviews. BMJ 372. https://doi.org/10.1136/bmj.n71
Imel S (2011) Writing a literature review. In: Tonette RS, Hatcher T (eds) The handbook of scholarly writing and publishing. Jossey-Bass, San Francisco, CA, pp 145–160
Google Scholar
Boote DN, Beile P (2005) Scholars before researchers: on the centrality of the dissertation literature review in research preparation. Educ Res 34:3–15. https://doi.org/10.3102/0013189X034006003
Bryman A (2008) Social research methods. Oxford University Press, New York, NY
Taylor D (n.d.) The literature review: a few tips on conducting it. https://advice.writing.utoronto.ca/types-of-writing/literature-review/ . Accessed 1 Oct 2022
Torraco RJ (2005) Writing integrative literature reviews: guidelines and examples. Hum Resour Dev Rev 4(3):356–367. https://doi.org/10.1177/1534484305278283
Cooper HM (1988) Organizing knowledge syntheses: a taxonomy of literature reviews. Knowl Soc 1:104–126. https://doi.org/10.1007/BF03177550
Cooper H (2010) Research synthesis and meta-analysis. 4th ed. Applied social research methods series, vol 2. Sage, Los Angelas, CA
Cooper H (2003) Psychological bulletin: editorial. Psychol Bull 129:3–9. https://doi.org/10.1037/0033-2909.129.1.3
Hart C (2018) Doing a literature review: releasing the research imagination, 2nd edn. Sage, Los Angelas, CA
Tricco AC, Lillie E, Zarin W, O’Brien K, Colquhoun H, Kastner M et al (2016) A scoping review on the conduct and reporting of scoping reviews. BMC Med Res Methodol 16:15. https://doi.org/10.1186/s12874-016-0116-4
Article PubMed PubMed Central Google Scholar
Torraco RJ (2016) Writing integrative literature reviews: using the past and present to explore the future. Hum Resour Dev Rev 15:404–428. https://doi.org/10.1177/1534484316671606
Doty DH, Glick WH (1994) Typologies as a unique form of theory building: toward improved understanding and modeling. Acad Manag Rev 19:230–251. https://doi.org/10.5465/AMR.1994.9410210748
Leedy PD, Ormrod JE (2005) Practical research: planning and design, 8th edn. Pearson, Upper Saddle River, NJ
Ragins BR (2012) Reflections on the craft of clear writing. Acad Manag Rev 37:493–501. https://doi.org/10.5465/amr.2012.0165
King S (2000) On writing: a memoir of the craft. Scribner, New York, NY
Torraco RJ (2016) Research methods for theory building in applied disciplines: a comparative analysis. Adv Dev Hum Resour 4:355–376. https://doi.org/10.1177/1523422302043008
Pendleton-Jullian AM, Brown JS (2018) Design unbound: designing for emergence in a white water world. MIT Press, Cambridge, MA
Book Google Scholar
Simon HA (2019) The sciences of the artificial [reissue of 3rd ed.]. MIT Press, Cambridge, MA
Klir GJ (2009) W. Ross Ashby: a pioneer of systems science. Int J Gen Syst 38:175–188. https://doi.org/10.1080/03081070802601434
Reen J (2020) The evolution of knowledge: rethinking science for the anthropocene. Princeton University Press, Princeton, NJ
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Turner, J.R. (2023). Literature Reviews: An Overview of Systematic, Integrated, and Scoping Reviews. In: Jagadeesh, G., Balakumar, P., Senatore, F. (eds) The Quintessence of Basic and Clinical Research and Scientific Publishing. Springer, Singapore. https://doi.org/10.1007/978-981-99-1284-1_38
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A systematic review attempts to collate all empirical evidence that fits pre-specified eligibility criteria in order to answer a specific research question
The evidence pyramid (image above) visually depicts the evidential strength of different research designs. Studies with the highest internal validity, characterized by a high degree of quantitative analysis, review, analysis, and stringent scientific methodology, are at the top of the pyramid. Observational research and expert opinion reside at the bottom of the pyramid. In evidence-based practice the systematic review is considered the highest level of information and is at the top of the pyramid. ( The pyramid was produced by HLWIKI Canada and is CC).
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Scoping reviews are a relatively new approach to evidence synthesis and currently there exists little guidance regarding the decision to choose between a systematic review or scoping review approach when synthesising evidence. The purpose of this article is to clearly describe the differences in indications between scoping reviews and systematic reviews and to provide guidance for when a scoping review is (and is not) appropriate.
Researchers may conduct scoping reviews instead of systematic reviews where the purpose of the review is to identify knowledge gaps, scope a body of literature, clarify concepts or to investigate research conduct. While useful in their own right, scoping reviews may also be helpful precursors to systematic reviews and can be used to confirm the relevance of inclusion criteria and potential questions.
Scoping reviews are a useful tool in the ever increasing arsenal of evidence synthesis approaches. Although conducted for different purposes compared to systematic reviews, scoping reviews still require rigorous and transparent methods in their conduct to ensure that the results are trustworthy. Our hope is that with clear guidance available regarding whether to conduct a scoping review or a systematic review, there will be less scoping reviews being performed for inappropriate indications better served by a systematic review, and vice-versa.
Peer Review reports
Systematic reviews in healthcare began to appear in publication in the 1970s and 1980s [ 1 , 2 ]. With the emergence of groups such as Cochrane and the Joanna Briggs Institute (JBI) in the 1990s [ 3 ], reviews have exploded in popularity both in terms of the number conducted [ 1 ], and their uptake to inform policy and practice. Today, systematic reviews are conducted for a wide range of purposes across diverse fields of inquiry, different evidence types and for different questions [ 4 ]. More recently, the field of evidence synthesis has seen the emergence of scoping reviews, which are similar to systematic reviews in that they follow a structured process, however they are performed for different reasons and have some key methodological differences [ 5 , 6 , 7 , 8 ]. Scoping reviews are now seen as a valid approach in those circumstances where systematic reviews are unable to meet the necessary objectives or requirements of knowledge users. There now exists clear guidance regarding the definition of scoping reviews, how to conduct scoping reviews and the steps involved in the scoping review process [ 6 , 8 ]. However, the guidance regarding the key indications or reasons why reviewers may choose to follow a scoping review approach is not as straightforward, with scoping reviews often conducted for purposes that do not align with the original indications as proposed by Arksey and O’Malley [ 5 , 6 , 7 , 8 , 9 , 10 ]. As editors and peer reviewers for various journals we have noticed that there is inconsistency and confusion regarding the indications for scoping reviews and a lack of clarity for authors regarding when a scoping review should be performed as opposed to a systematic review. The purpose of this article is to provide practical guidance for reviewers on when to perform a systematic review or a scoping review, supported with some key examples.
Systematic reviews can be broadly defined as a type of research synthesis that are conducted by review groups with specialized skills, who set out to identify and retrieve international evidence that is relevant to a particular question or questions and to appraise and synthesize the results of this search to inform practice, policy and in some cases, further research [ 11 , 12 , 13 ]. According to the Cochrane handbook, a systematic review ‘uses explicit, systematic methods that are selected with a view to minimizing bias, thus providing more reliable findings from which conclusions can be drawn and decisions made.’ [ 14 ] Systematic reviews follow a structured and pre-defined process that requires rigorous methods to ensure that the results are both reliable and meaningful to end users. These reviews may be considered the pillar of evidence-based healthcare [ 15 ] and are widely used to inform the development of trustworthy clinical guidelines [ 11 , 16 , 17 ].
A systematic review may be undertaken to confirm or refute whether or not current practice is based on relevant evidence, to establish the quality of that evidence, and to address any uncertainty or variation in practice that may be occurring. Such variations in practice may be due to conflicting evidence and undertaking a systematic review should (hopefully) resolve such conflicts. Conducting a systematic review may also identify gaps, deficiencies, and trends in the current evidence and can help underpin and inform future research in the area. Systematic reviews can be used to produce statements to guide clinical decision-making, the delivery of care, as well as policy development [ 12 ]. Broadly, indications for systematic reviews are as follows [ 4 ]:
Uncover the international evidence
Confirm current practice/ address any variation/ identify new practices
Identify and inform areas for future research
Identify and investigate conflicting results
Produce statements to guide decision-making
Despite the utility of systematic reviews to address the above indications, there are cases where systematic reviews are unable to meet the necessary objectives or requirements of knowledge users or where a methodologically robust and structured preliminary searching and scoping activity may be useful to inform the conduct of the systematic reviews. As such, scoping reviews (which are also sometimes called scoping exercises/scoping studies) [ 8 ] have emerged as a valid approach with rather different indications to those for systematic reviews. It is important to note here that other approaches to evidence synthesis have also emerged, including realist reviews, mixed methods reviews, concept analyses and others [ 4 , 18 , 19 , 20 ]. This article focuses specifically on the choice between a systematic review or scoping review approach.
True to their name, scoping reviews are an ideal tool to determine the scope or coverage of a body of literature on a given topic and give clear indication of the volume of literature and studies available as well as an overview (broad or detailed) of its focus. Scoping reviews are useful for examining emerging evidence when it is still unclear what other, more specific questions can be posed and valuably addressed by a more precise systematic review [ 21 ]. They can report on the types of evidence that address and inform practice in the field and the way the research has been conducted.
The general purpose for conducting scoping reviews is to identify and map the available evidence [ 5 , 22 ]. Arskey and O’Malley, authors of the seminal paper describing a framework for scoping reviews, provided four specific reasons why a scoping review may be conducted [ 5 , 6 , 7 , 22 ]. Soon after, Levac, Colquhoun and O’Brien further clarified and extended this original framework [ 7 ]. These authors acknowledged that at the time, there was no universally recognized definition of scoping reviews nor a commonly acknowledged purpose or indication for conducting them. In 2015, a methodological working group of the JBI produced formal guidance for conducting scoping reviews [ 6 ]. However, we have not previously addressed and expanded upon the indications for scoping reviews. Below, we build upon previously described indications and suggest the following purposes for conducting a scoping review:
To clarify key concepts/ definitions in the literature
To examine how research is conducted on a certain topic or field
As a precursor to a systematic review.
To identify and analyse knowledge gaps
Authors deciding between the systematic review or scoping review approach should carefully consider the indications discussed above for each synthesis type and determine exactly what question they are asking and what purpose they are trying to achieve with their review. We propose that the most important consideration is whether or not the authors wish to use the results of their review to answer a clinically meaningful question or provide evidence to inform practice. If the authors have a question addressing the feasibility, appropriateness, meaningfulness or effectiveness of a certain treatment or practice, then a systematic review is likely the most valid approach [ 11 , 23 ]. However, authors do not always wish to ask such single or precise questions, and may be more interested in the identification of certain characteristics/concepts in papers or studies, and in the mapping, reporting or discussion of these characteristics/concepts. In these cases, a scoping review is the better choice.
As scoping reviews do not aim to produce a critically appraised and synthesised result/answer to a particular question, and rather aim to provide an overview or map of the evidence. Due to this, an assessment of methodological limitations or risk of bias of the evidence included within a scoping review is generally not performed (unless there is a specific requirement due to the nature of the scoping review aim) [ 6 ]. Given this assessment of bias is not conducted, the implications for practice (from a clinical or policy making point of view) that arise from a scoping review are quite different compared to those of a systematic review. In some cases, there may be no need or impetus to make implications for practice and if there is a need to do so, these implications may be significantly limited in terms of providing concrete guidance from a clinical or policy making point of view. Conversely, when we compare this to systematic reviews, the provision of implications for practice is a key feature of systematic reviews and is recommended in reporting guidelines for systematic reviews [ 13 ].
In the following section, we elaborate on each of the indications listed for scoping reviews and provide a number of examples for authors considering a scoping review approach.
Scoping reviews that seek to identify the types of evidence in a given field share similarities with evidence mapping activities as explained by Bragge and colleagues in a paper on conducting scoping research in broad topic areas [ 24 ]. Chambers and colleagues [ 25 ] conducted a scoping review in order to identify current knowledge translation resources (and any evaluations of them) that use, adapt and present findings from systematic reviews to suit the needs of policy makers. Following a comprehensive search across a range of databases, organizational websites and conference abstract repositories based upon predetermined inclusion criteria, the authors identified 20 knowledge translation resources which they classified into three different types (overviews, summaries and policy briefs) as well as seven published and unpublished evaluations. The authors concluded that evidence synthesists produce a range of resources to assist policy makers to transfer and utilize the findings of systematic reviews and that focussed summaries are the most common. Similarly, a scoping review was conducted by Challen and colleagues [ 26 ] in order to determine the types of available evidence identifying the source and quality of publications and grey literature for emergency planning. A comprehensive set of databases and websites were investigated and 1603 relevant sources of evidence were identified mainly addressing emergency planning and response with fewer sources concerned with hazard analysis, mitigation and capability assessment. Based on the results of the review, the authors concluded that while there is a large body of evidence in the field, issues with its generalizability and validity are as yet largely unknown and that the exact type and form of evidence that would be valuable to knowledge users in the field is not yet understood.
Scoping reviews are often performed to examine and clarify definitions that are used in the literature. A scoping review by Schaink and colleagues 27 was performed to investigate how the notion of “patient complexity” had been defined, classified, and understood in the existing literature. A systematic search of healthcare databases was conducted. Articles were assessed to determine whether they met the inclusion criteria and the findings of included articles were grouped into five health dimensions. An overview of how complexity has been described was presented, including the varying definitions and interpretations of the term. The results of the scoping review enabled the authors to then develop a complexity framework or model to assist in defining and understanding patient complexity [ 27 ].
Hines et al. [ 28 ] provide a further example where a scoping review has been conducted to define a concept, in this case the condition bronchopulmonary dysplasia. The authors revealed significant variation in how the condition was defined across the literature, prompting the authors to call for a ‘comprehensive and evidence-based definition’. [ 28 ]
Scoping reviews can be useful tools to investigate the design and conduct of research on a particular topic. A scoping review by Callary and colleagues 29 investigated the methodological design of studies assessing wear of a certain type of hip replacement (highly crosslinked polyethylene acetabular components) [ 29 ]. The aim of the scoping review was to survey the literature to determine how data pertinent to the measurement of hip replacement wear had been reported in primary studies and whether the methods were similar enough to allow for comparison across studies. The scoping review revealed that the methods to assess wear (radiostereometric analysis) varied significantly with many different approaches being employed amongst the investigators. The results of the scoping review led to the authors recommending enhanced standardization in measurements and methods for future research in this field [ 29 ].
There are other examples of scoping reviews investigating research methodology, with perhaps the most pertinent examples being two recent scoping reviews of scoping review methods [ 9 , 10 ]. Both of these scoping reviews investigated how scoping reviews had been reported and conducted, with both advocating for a need for clear guidance to improve standardization of methods [ 9 , 10 ]. Similarly, a scoping review investigating methodology was conducted by Tricco and colleagues 30 on rapid review methods that have been evaluated, compared, used or described in the literature. A variety of rapid review approaches were identified with many instances of poor reporting identified. The authors called for prospective studies to compare results presented by rapid reviews versus systematic reviews.
Scoping reviews can be conducted to identify and examine characteristics or factors related to a particular concept. Harfield and colleagues (2015) conducted a scoping review to identify the characteristics of indigenous primary healthcare service delivery models [ 30 , 31 , 32 ]. A systematic search was conducted, followed by screening and study selection. Once relevant studies had been identified, a process of data extraction commenced to extract characteristics referred to in the included papers. Over 1000 findings were eventually grouped into eight key factors (accessible health services, community participation, culturally appropriate and skilled workforce, culture, continuous quality improvement, flexible approaches to care, holistic health care, self-determination and empowerment). The results of this scoping review have been able to inform a best practice model for indigenous primary healthcare services.
Scoping reviews conducted as precursors to systematic reviews may enable authors to identify the nature of a broad field of evidence so that ensuing reviews can be assured of locating adequate numbers of relevant studies for inclusion. They also enable the relevant outcomes and target group or population for example for a particular intervention to be identified. This can have particular practical benefits for review teams undertaking reviews on less familiar topics and can assist the team to avoid undertaking an “empty” review [ 33 ]. Scoping reviews of this kind may help reviewers to develop and confirm their a priori inclusion criteria and ensure that the questions to be posed by their subsequent systematic review are able to be answered by available, relevant evidence. In this way, systematic reviews are able to be underpinned by a preliminary and evidence-based scoping stage.
A scoping review commissioned by the United Kingdom Department for International Development was undertaken to determine the scope and nature of literature on people’s experiences of microfinance. The results of this scoping review were used to inform the development of targeted systematic review questions that focussed upon areas of particular interest [ 34 ].
In their recent scoping review on the conduct and reporting of scoping reviews, Tricco and colleagues 10 reveal only 12% of scoping reviews contained recommendations for the development of ensuing systematic reviews, suggesting that the majority of scoping review authors do not conduct scoping reviews as a precursor to future systematic reviews.
Scoping reviews are rarely solely conducted to simply identify and analyze gaps present in a given knowledge base, as examination and presentation of what hasn’t been investigated or reported generally requires exhaustive examination of all of what is available. In any case, because scoping reviews tend to be a useful approach for reviewing evidence rapidly in emerging fields or topics, identification and analysis of knowledge gaps is a common and valuable indication for conducting a scoping review. A scoping review was recently conducted to review current research and identify knowledge gaps on the topic of “occupational balance”, or the balance of work, rest, sleep, and play [ 35 ]. Following a systematic search across a range of relevant databases, included studies were selected and in line with predetermined inclusion criteria, were described and mapped to provide both an overall picture of the current state of the evidence in the field and to identify and highlight knowledge gaps in the area. The results of the scoping review allowed the authors to illustrate several research ‘gaps’, including the absence of studies conducted outside of western societies, the lack of knowledge around peoples’ levels of occupational balance, as well as a dearth of evidence regarding how occupational balance may be enhanced. As with other scoping reviews focussed upon identifying and analyzing knowledge gaps, results such as these allow for the identification of future research initiatives.
Scoping reviews are now seen as a valid review approach for certain indications. A key difference between scoping reviews and systematic reviews is that in terms of a review question, a scoping review will have a broader “scope” than traditional systematic reviews with correspondingly more expansive inclusion criteria. In addition, scoping reviews differ from systematic reviews in their overriding purpose. We have previously recommended the use of the PCC mnemonic (Population, Concept and Context) to guide question development [ 36 ]. The importance of clearly defining the key questions and objectives of a scoping review has been discussed previously by one of the authors, as a lack of clarity can result in difficulties encountered later on in the review process [ 36 ].
Considering their differences from systematic reviews, scoping reviews should still not be confused with traditional literature reviews. Traditional literature reviews have been used as a means to summarise various publications or research on a particular topic for many years. In these traditional reviews, authors examine research reports in addition to conceptual or theoretical literature that focuses on the history, importance, and collective thinking around a topic, issue or concept. These types of reviews can be considered subjective, due to their substantial reliance on the author’s pre-exiting knowledge and experience and as they do not normally present an unbiased, exhaustive and systematic summary of a topic [ 12 ]. Regardless of some of these limitations, traditional literature reviews may still have some use in terms of providing an overview of a topic or issue. Scoping reviews provide a useful alternative to literature reviews when clarification around a concept or theory is required. If traditional literature reviews are contrasted with scoping reviews, the latter [ 6 ]:
Are informed by an a priori protocol
Are systematic and often include exhaustive searching for information
Aim to be transparent and reproducible
Include steps to reduce error and increase reliability (such as the inclusion of multiple reviewers)
Ensure data is extracted and presented in a structured way
Another approach to evidence synthesis that has emerged recently is the production of evidence maps [ 37 ]. The purpose of these evidence maps is similar to scoping reviews to identify and analyse gaps in the knowledge base [ 37 , 38 ]. In fact, most evidence mapping articles cite seminal scoping review guidance for their methods [ 38 ]. The two approaches therefore have many similarities, with perhaps the most prominent difference being the production of a visual database or schematic (i.e. map) which assists the user in interpreting where evidence exists and where there are gaps [ 38 ]. As Miake-Lye states, at this stage ‘it is difficult to determine where one method ends and the other begins.’ [ 38 ] Both approaches may be valid when the indication is for determining the extent of evidence on a particular topic, particularly when highlighting gaps in the research.
A further popular method to define and scope concepts, particularly in nursing, is through the conduct of a concept analysis [ 39 , 40 , 41 , 42 ]. Formal concept analysis is ‘a process whereby concepts are logically and systematically investigated to form clear and rigorously constructed conceptual definitions,’ [ 42 ] which is similar to scoping reviews where the indication is to clarify concepts in the literature. There is limited methodological guidance on how to conduct a concept analysis and recently they have been critiqued for having no impact on practice [ 39 ]. In our opinion, scoping reviews (where the purpose is to systematically investigate a concept in the literature) offer a methodologically rigorous alternative to concept analysis with their results perhaps being more useful to inform practice.
Comparing and contrasting the characteristics of traditional literature reviews, scoping reviews and systematic reviews may help clarify the true essence of these different types of reviews (see Table 1 ).
Rapid reviews are another emerging type of evidence synthesis and a substantial amount of literature have addressed these types of reviews [ 43 , 44 , 45 , 46 , 47 ]. There are various definitions for rapid reviews, and for simplification purposes, we define these review types as ‘systematic reviews with shortcuts.’ In this paper, we have not discussed the choice between a rapid or systematic review approach as we are of the opinion that perhaps the major consideration for conducting a rapid review (as compared to a systematic or scoping review) is not the purpose/question itself, but the feasibility of conducting a full review given financial/resource limitations and time pressures. As such, a rapid review could potentially be conducted for any of the indications listed above for the scoping or systematic review, whilst shortening or skipping entirely some steps in the standard systematic or scoping review process.
There is some overlap across the six listed purposes for conducting a scoping review described in this paper. For example, it is logical to presume that if a review group were aiming to identify the types of available evidence in a field they would also be interested in identifying and analysing gaps in the knowledge base. Other combinations of purposes for scoping reviews would also make sense for certain questions/aims. However, we have chosen to list them as discrete reasons in this paper in an effort to provide some much needed clarity on the appropriate purposes for conducting scoping reviews. As such, scoping review authors should not interpret our list of indications as a discrete list where only one purpose can be identified.
It is important to mention some potential abuses of scoping reviews. Reviewers may conduct a scoping review as an alternative to a systematic review in order to avoid the critical appraisal stage of the review and expedite the process, thinking that a scoping review may be easier than a systematic review to conduct. Other reviewers may conduct a scoping review in order to ‘map’ the literature when there is no obvious need for ‘mapping’ in this particular subject area. Others may conduct a scoping review with very broad questions as an alternative to investing the time and effort required to craft the necessary specific questions required for undertaking a systematic review. In these cases, scoping reviews are not appropriate and authors should refer to our guidance regarding whether they should be conducting a systematic review instead.
This article provides some clarification on when to conduct a scoping review as compared to a systematic review and clear guidance on the purposes for conducting a scoping review. We hope that this paper will provide a useful addition to this evolving methodology and encourage others to review, modify and build upon these indications as the approach matures. Further work in scoping review methods is required, with perhaps the most important advancement being the recent development of an extension to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) for scoping reviews [ 48 ] and the development of software and training programs to support these reviews [ 49 , 50 ]. As the methodology advances, guidance for scoping reviews (such as that included in the Joanna Briggs Institute Reviewer’s Manual) will require revision, refining and updating.
Scoping reviews are a useful tool in the ever increasing arsenal of evidence synthesis approaches. Researchers may preference the conduct of a scoping review over a systematic review where the purpose of the review is to identify knowledge gaps, scope a body of literature, clarify concepts, investigate research conduct, or to inform a systematic review. Although conducted for different purposes compared to systematic reviews, scoping reviews still require rigorous and transparent methods in their conduct to ensure that the results are trustworthy. Our hope is that with clear guidance available regarding whether to conduct a scoping review or a systematic review, there will be less scoping reviews being performed for inappropriate indications better served by a systematic review, and vice-versa.
Bastian H, Glasziou P, Chalmers I. Seventy-five trials and eleven systematic reviews a day: how will we ever keep up? PLoS Med. 2010;7(9):e1000326.
Article Google Scholar
Chalmers I, Hedges LV, Cooper H. A brief history of research synthesis. Eval Health Prof. 2002;25(1):12–37.
Jordan Z, Munn Z, Aromataris E, Lockwood C. Now that we're here, where are we? The JBI approach to evidence-based healthcare 20 years on. Int J Evid Based Healthc. 2015;13(3):117–20.
Munn Z, Stern C, Aromataris E, Lockwood C, Jordan Z. What kind of systematic review should I conduct? A proposed typology and guidance for systematic reviewers in the medical and health sciences. BMC Med Res Methodol. 2018;18(1):5.
Arksey H, O'Malley L. Scoping studies: towards a methodological framework. Int J Soc Res Methodol. 2005;8(1):19–32.
Peters MD, Godfrey CM, Khalil H, McInerney P, Parker D, Soares CB. Guidance for conducting systematic scoping reviews. Int J Evid Based Healthc. 2015;13(3):141–6.
Levac D, Colquhoun H, O'Brien KK. Scoping studies: advancing the methodology. Implement Sci. 2010;5(1):1.
Colquhoun HL, Levac D, O'Brien KK, et al. Scoping reviews: time for clarity in definition, methods, and reporting. J Clin Epidemiol. 2014;67(12):1291–4.
Pham MT, Rajić A, Greig JD, Sargeant JM, Papadopoulos A, McEwen SA. A scoping review of scoping reviews: advancing the approach and enhancing the consistency. Res Synth Methods. 2014;5(4):371–85.
Tricco AC, Lillie E, Zarin W, et al. A scoping review on the conduct and reporting of scoping reviews. BMC Med Res Methodol. 2016;16:15.
Pearson A. Balancing the evidence: incorporating the synthesis of qualitative data into systematic reviews. JBI Reports. 2004;2:45–64.
Aromataris E, Pearson A. The systematic review: an overview. AJN The American Journal of Nursing. 2014;114(3):53–8.
Liberati A, Altman DG, Tetzlaff J, et al. The PRISMA statement for reporting systematic reviews and meta-analyses of studies that evaluate healthcare interventions: explanation and elaboration. BMJ (Clinical research ed). 2009;339:b2700.
Higgins J, Green S, eds. Cochrane handbook for systematic reviews of interventions. Version 5.1.0 [updated March 2011]. ed: The Cochrane Collaboration 2011.
Munn Z, Porritt K, Lockwood C, Aromataris E, Pearson A. Establishing confidence in the output of qualitative research synthesis: the ConQual approach. BMC Med Res Methodol. 2014;14:108.
Pearson A, Jordan Z, Munn Z. Translational science and evidence-based healthcare: a clarification and reconceptualization of how knowledge is generated and used in healthcare. Nursing research and practice. 2012;2012:792519.
Steinberg E, Greenfield S, Mancher M, Wolman DM, Graham R. Clinical practice guidelines we can trust. Institute of Medicine. Washington, DC: National Academies Press; 2011.
Gough D, Thomas J, Oliver S. Clarifying differences between review designs and methods. Systematic Reviews. 2012;1:28.
Grant MJ, Booth A. A typology of reviews: an analysis of 14 review types and associated methodologies. Health Inf Libr J. 2009;26(2):91–108.
Tricco AC, Tetzlaff J, Moher D. The art and science of knowledge synthesis. J Clin Epidemiol. 2011;64(1):11–20.
Armstrong R, Hall BJ, Doyle J, Waters E. ‘Scoping the scope’ of a cochrane review. J Public Health. 2011;33(1):147–50.
Anderson S, Allen P, Peckham S, Goodwin N. Asking the right questions: scoping studies in the commissioning of research on the organisation and delivery of health services. Health Research Policy and Systems. 2008;6(1):1.
Pearson A, Wiechula R, Court A, Lockwood C. The JBI model of evidence-based healthcare. International Journal of Evidence-Based Healthcare. 2005;3(8):207–15.
PubMed Google Scholar
Bragge P, Clavisi O, Turner T, Tavender E, Collie A, Gruen RL. The global evidence mapping initiative: scoping research in broad topic areas. BMC Med Res Methodol. 2011;11:92.
Chambers D, Wilson PM, Thompson CA, Hanbury A, Farley K, Light K. Maximizing the impact of systematic reviews in health care decision making: a systematic scoping review of knowledge-translation resources. Milbank Q. 2011;89(1):131–56.
Challen K, Lee AC, Booth A, Gardois P, Woods HB, Goodacre SW. Where is the evidence for emergency planning: a scoping review. BMC Public Health. 2012;12:542.
Schaink AK, Kuluski K, Lyons RF, et al. A scoping review and thematic classification of patient complexity: offering a unifying framework. Journal of comorbidity. 2012;2(1):1–9.
Hines D, Modi N, Lee SK, Isayama T, Sjörs G, Gagliardi L, Lehtonen L, Vento M, Kusuda S, Bassler D, Mori R. Scoping review shows wide variation in the definitions of bronchopulmonary dysplasia in preterm infants and calls for a consensus. Acta Paediatr. 2017;106(3):366–74.
Callary SA, Solomon LB, Holubowycz OT, Campbell DG, Munn Z, Howie DW. Wear of highly crosslinked polyethylene acetabular components. Acta Orthop. 2015;86(2):159–68.
Davy C, Harfield S, McArthur A, Munn Z, Brown A. Access to primary health care services for indigenous peoples: a framework synthesis. Int J Equity Health. 2016;15(1):163.
Harfield S, Davy C, Kite E, et al. Characteristics of indigenous primary health care models of service delivery: a scoping review protocol. JBI Database System Rev Implement Rep. 2015;13(11):43–51.
Harfield SG, Davy C, McArthur A, Munn Z, Brown A, Brown N. Characteristics of indigenous primary health care service delivery models: a systematic scoping review. Glob Health. 2018;14(1):12.
Peters MDJ LC, Munn Z, Moola S, Mishra RK (2015) , Protocol. Adelaide: the Joanna Briggs Institute UoA. What are people’s views and experiences of delivering and participating in microfinance interventions? A systematic review of qualitative evidence from South Asia.
Peters MDJ LC, Munn Z, Moola S, Mishra RK People’s views and experiences of participating in microfinance interventions: A systematic review of qualitative evidence. London: EPPI-Centre: social science research unit, UCL Institute of education, University College London; 2016.
Wagman P, Håkansson C, Jonsson H. Occupational balance: a scoping review of current research and identified knowledge gaps. J Occup Sci. 2015;22(2):160–9.
Peters MD. In no uncertain terms: the importance of a defined objective in scoping reviews. JBI Database System Rev Implement Rep. 2016;14(2):1–4.
Hetrick SE, Parker AG, Callahan P, Purcell R. Evidence mapping: illustrating an emerging methodology to improve evidence-based practice in youth mental health. J Eval Clin Pract. 2010;16(6):1025–30.
Miake-Lye IM, Hempel S, Shanman R, Shekelle PG. What is an evidence map? A systematic review of published evidence maps and their definitions, methods, and products. Systematic reviews. 2016;5(1):1.
Draper P. A critique of concept analysis. J Adv Nurs. 2014;70(6):1207–8.
Gibson CH. A concept analysis of empowerment. J Adv Nurs. 1991;16(3):354–61.
Article CAS Google Scholar
Meeberg GA. Quality of life: a concept analysis. J Adv Nurs. 1993;18(1):32–8.
Ream E, Richardson A. Fatigue: a concept analysis. Int J Nurs Stud. 1996;33(5):519–29.
Tricco AC, Antony J, Zarin W, et al. A scoping review of rapid review methods. BMC Med. 2015;13:224.
Ganann R, Ciliska D, Thomas H. Expediting systematic reviews: methods and implications of rapid reviews. Implement Sci. 2010;5:56.
Harker J, Kleijnen J. What is a rapid review? A methodological exploration of rapid reviews in health technology assessments. Int J Evid Based Healthc. 2012;10(4):397–410.
Khangura S, Konnyu K, Cushman R, Grimshaw J, Moher D. Evidence summaries: the evolution of a rapid review approach. Syst Rev. 2012;1:10.
Munn Z, Lockwood C, Moola S. The development and use of evidence summaries for point of care information systems: a streamlined rapid review approach. Worldviews Evid-Based Nurs. 2015;12(3):131–8.
Tricco AC, Lillie E, Zarin W, et al. PRISMA extension for scoping reviews (PRISMA-ScR): checklist and explanation. Ann Intern Med. 2018;169(7):467–73.
Munn Z, Aromataris E, Tufanaru C, Stern C, Porritt K, Farrow J, Lockwood C, Stephenson M, Moola S, Lizarondo L, McArthur A. The development of software to support multiple systematic review types: the Joanna Briggs institute system for the unified management, assessment and review of information (JBI SUMARI). Int J Evid Based Healthc. 2018. (in press)
Stern C, Munn Z, Porritt K, et al. An international educational training course for conducting systematic reviews in health care: the Joanna Briggs Institute's comprehensive systematic review training program. Worldviews Evid-Based Nurs. 2018;15(5):401–8.
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Munn, Z., Peters, M.D.J., Stern, C. et al. Systematic review or scoping review? Guidance for authors when choosing between a systematic or scoping review approach. BMC Med Res Methodol 18 , 143 (2018). https://doi.org/10.1186/s12874-018-0611-x
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DOI : https://doi.org/10.1186/s12874-018-0611-x
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1 Centre for Functional and Evolutionary Ecology (CEFE), CNRS, Montpellier, France
2 Centre for Biodiversity Synthesis and Analysis (CESAB), FRB, Aix-en-Provence, France
Literature reviews are in great demand in most scientific fields. Their need stems from the ever-increasing output of scientific publications [1] . For example, compared to 1991, in 2008 three, eight, and forty times more papers were indexed in Web of Science on malaria, obesity, and biodiversity, respectively [2] . Given such mountains of papers, scientists cannot be expected to examine in detail every single new paper relevant to their interests [3] . Thus, it is both advantageous and necessary to rely on regular summaries of the recent literature. Although recognition for scientists mainly comes from primary research, timely literature reviews can lead to new synthetic insights and are often widely read [4] . For such summaries to be useful, however, they need to be compiled in a professional way [5] .
When starting from scratch, reviewing the literature can require a titanic amount of work. That is why researchers who have spent their career working on a certain research issue are in a perfect position to review that literature. Some graduate schools are now offering courses in reviewing the literature, given that most research students start their project by producing an overview of what has already been done on their research issue [6] . However, it is likely that most scientists have not thought in detail about how to approach and carry out a literature review.
Reviewing the literature requires the ability to juggle multiple tasks, from finding and evaluating relevant material to synthesising information from various sources, from critical thinking to paraphrasing, evaluating, and citation skills [7] . In this contribution, I share ten simple rules I learned working on about 25 literature reviews as a PhD and postdoctoral student. Ideas and insights also come from discussions with coauthors and colleagues, as well as feedback from reviewers and editors.
How to choose which topic to review? There are so many issues in contemporary science that you could spend a lifetime of attending conferences and reading the literature just pondering what to review. On the one hand, if you take several years to choose, several other people may have had the same idea in the meantime. On the other hand, only a well-considered topic is likely to lead to a brilliant literature review [8] . The topic must at least be:
Ideas for potential reviews may come from papers providing lists of key research questions to be answered [9] , but also from serendipitous moments during desultory reading and discussions. In addition to choosing your topic, you should also select a target audience. In many cases, the topic (e.g., web services in computational biology) will automatically define an audience (e.g., computational biologists), but that same topic may also be of interest to neighbouring fields (e.g., computer science, biology, etc.).
After having chosen your topic and audience, start by checking the literature and downloading relevant papers. Five pieces of advice here:
The chances are high that someone will already have published a literature review ( Figure 1 ), if not exactly on the issue you are planning to tackle, at least on a related topic. If there are already a few or several reviews of the literature on your issue, my advice is not to give up, but to carry on with your own literature review,
The bottom-right situation (many literature reviews but few research papers) is not just a theoretical situation; it applies, for example, to the study of the impacts of climate change on plant diseases, where there appear to be more literature reviews than research studies [33] .
When searching the literature for pertinent papers and reviews, the usual rules apply:
If you read the papers first, and only afterwards start writing the review, you will need a very good memory to remember who wrote what, and what your impressions and associations were while reading each single paper. My advice is, while reading, to start writing down interesting pieces of information, insights about how to organize the review, and thoughts on what to write. This way, by the time you have read the literature you selected, you will already have a rough draft of the review.
Of course, this draft will still need much rewriting, restructuring, and rethinking to obtain a text with a coherent argument [11] , but you will have avoided the danger posed by staring at a blank document. Be careful when taking notes to use quotation marks if you are provisionally copying verbatim from the literature. It is advisable then to reformulate such quotes with your own words in the final draft. It is important to be careful in noting the references already at this stage, so as to avoid misattributions. Using referencing software from the very beginning of your endeavour will save you time.
After having taken notes while reading the literature, you will have a rough idea of the amount of material available for the review. This is probably a good time to decide whether to go for a mini- or a full review. Some journals are now favouring the publication of rather short reviews focusing on the last few years, with a limit on the number of words and citations. A mini-review is not necessarily a minor review: it may well attract more attention from busy readers, although it will inevitably simplify some issues and leave out some relevant material due to space limitations. A full review will have the advantage of more freedom to cover in detail the complexities of a particular scientific development, but may then be left in the pile of the very important papers “to be read” by readers with little time to spare for major monographs.
There is probably a continuum between mini- and full reviews. The same point applies to the dichotomy of descriptive vs. integrative reviews. While descriptive reviews focus on the methodology, findings, and interpretation of each reviewed study, integrative reviews attempt to find common ideas and concepts from the reviewed material [12] . A similar distinction exists between narrative and systematic reviews: while narrative reviews are qualitative, systematic reviews attempt to test a hypothesis based on the published evidence, which is gathered using a predefined protocol to reduce bias [13] , [14] . When systematic reviews analyse quantitative results in a quantitative way, they become meta-analyses. The choice between different review types will have to be made on a case-by-case basis, depending not just on the nature of the material found and the preferences of the target journal(s), but also on the time available to write the review and the number of coauthors [15] .
Whether your plan is to write a mini- or a full review, it is good advice to keep it focused 16 , 17 . Including material just for the sake of it can easily lead to reviews that are trying to do too many things at once. The need to keep a review focused can be problematic for interdisciplinary reviews, where the aim is to bridge the gap between fields [18] . If you are writing a review on, for example, how epidemiological approaches are used in modelling the spread of ideas, you may be inclined to include material from both parent fields, epidemiology and the study of cultural diffusion. This may be necessary to some extent, but in this case a focused review would only deal in detail with those studies at the interface between epidemiology and the spread of ideas.
While focus is an important feature of a successful review, this requirement has to be balanced with the need to make the review relevant to a broad audience. This square may be circled by discussing the wider implications of the reviewed topic for other disciplines.
Reviewing the literature is not stamp collecting. A good review does not just summarize the literature, but discusses it critically, identifies methodological problems, and points out research gaps [19] . After having read a review of the literature, a reader should have a rough idea of:
It is challenging to achieve a successful review on all these fronts. A solution can be to involve a set of complementary coauthors: some people are excellent at mapping what has been achieved, some others are very good at identifying dark clouds on the horizon, and some have instead a knack at predicting where solutions are going to come from. If your journal club has exactly this sort of team, then you should definitely write a review of the literature! In addition to critical thinking, a literature review needs consistency, for example in the choice of passive vs. active voice and present vs. past tense.
Like a well-baked cake, a good review has a number of telling features: it is worth the reader's time, timely, systematic, well written, focused, and critical. It also needs a good structure. With reviews, the usual subdivision of research papers into introduction, methods, results, and discussion does not work or is rarely used. However, a general introduction of the context and, toward the end, a recapitulation of the main points covered and take-home messages make sense also in the case of reviews. For systematic reviews, there is a trend towards including information about how the literature was searched (database, keywords, time limits) [20] .
How can you organize the flow of the main body of the review so that the reader will be drawn into and guided through it? It is generally helpful to draw a conceptual scheme of the review, e.g., with mind-mapping techniques. Such diagrams can help recognize a logical way to order and link the various sections of a review [21] . This is the case not just at the writing stage, but also for readers if the diagram is included in the review as a figure. A careful selection of diagrams and figures relevant to the reviewed topic can be very helpful to structure the text too [22] .
Reviews of the literature are normally peer-reviewed in the same way as research papers, and rightly so [23] . As a rule, incorporating feedback from reviewers greatly helps improve a review draft. Having read the review with a fresh mind, reviewers may spot inaccuracies, inconsistencies, and ambiguities that had not been noticed by the writers due to rereading the typescript too many times. It is however advisable to reread the draft one more time before submission, as a last-minute correction of typos, leaps, and muddled sentences may enable the reviewers to focus on providing advice on the content rather than the form.
Feedback is vital to writing a good review, and should be sought from a variety of colleagues, so as to obtain a diversity of views on the draft. This may lead in some cases to conflicting views on the merits of the paper, and on how to improve it, but such a situation is better than the absence of feedback. A diversity of feedback perspectives on a literature review can help identify where the consensus view stands in the landscape of the current scientific understanding of an issue [24] .
In many cases, reviewers of the literature will have published studies relevant to the review they are writing. This could create a conflict of interest: how can reviewers report objectively on their own work [25] ? Some scientists may be overly enthusiastic about what they have published, and thus risk giving too much importance to their own findings in the review. However, bias could also occur in the other direction: some scientists may be unduly dismissive of their own achievements, so that they will tend to downplay their contribution (if any) to a field when reviewing it.
In general, a review of the literature should neither be a public relations brochure nor an exercise in competitive self-denial. If a reviewer is up to the job of producing a well-organized and methodical review, which flows well and provides a service to the readership, then it should be possible to be objective in reviewing one's own relevant findings. In reviews written by multiple authors, this may be achieved by assigning the review of the results of a coauthor to different coauthors.
Given the progressive acceleration in the publication of scientific papers, today's reviews of the literature need awareness not just of the overall direction and achievements of a field of inquiry, but also of the latest studies, so as not to become out-of-date before they have been published. Ideally, a literature review should not identify as a major research gap an issue that has just been addressed in a series of papers in press (the same applies, of course, to older, overlooked studies (“sleeping beauties” [26] )). This implies that literature reviewers would do well to keep an eye on electronic lists of papers in press, given that it can take months before these appear in scientific databases. Some reviews declare that they have scanned the literature up to a certain point in time, but given that peer review can be a rather lengthy process, a full search for newly appeared literature at the revision stage may be worthwhile. Assessing the contribution of papers that have just appeared is particularly challenging, because there is little perspective with which to gauge their significance and impact on further research and society.
Inevitably, new papers on the reviewed topic (including independently written literature reviews) will appear from all quarters after the review has been published, so that there may soon be the need for an updated review. But this is the nature of science [27] – [32] . I wish everybody good luck with writing a review of the literature.
Many thanks to M. Barbosa, K. Dehnen-Schmutz, T. Döring, D. Fontaneto, M. Garbelotto, O. Holdenrieder, M. Jeger, D. Lonsdale, A. MacLeod, P. Mills, M. Moslonka-Lefebvre, G. Stancanelli, P. Weisberg, and X. Xu for insights and discussions, and to P. Bourne, T. Matoni, and D. Smith for helpful comments on a previous draft.
This work was funded by the French Foundation for Research on Biodiversity (FRB) through its Centre for Synthesis and Analysis of Biodiversity data (CESAB), as part of the NETSEED research project. The funders had no role in the preparation of the manuscript.
About Systematic Reviews
Reviews in scientific research are tools that help synthesize literature on a topic of interest and describe its current state. Different types of reviews are conducted depending on the research question and the scope of the review. A systematic review is one such review that is robust, reproducible, and transparent. It involves collating evidence by using all of the eligible and critically appraised literature available on a certain topic. To know more about how to do a systematic review , you can check out our article at the link. The primary aim of a systematic review is to recommend best practices and inform policy development. Hence, there is a need for high-quality, focused, and precise methods and reporting. For more exploratory research questions, methods such as a scoping review are employed. Be sure you understand the difference between a systematic review and a scoping review , if you don’t, check out the link to learn more.
When the word “review” alone is used to describe a research paper, the first thing that should come to mind is that it is a literature review. Almost every researcher starts off their career with literature reviews. To know the difference between a systematic review and a literature review , read on here. Traditional literature reviews are also sometimes referred to as narrative reviews since they use narrative analysis to synthesize data. In this article, we will explore the differences between a systematic review and a narrative review, in further detail.
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Both systematic and narrative reviews are classified as secondary research studies since they both use existing primary research studies e.g. case studies. Despite this similarity, there are key differences in their methodology and scope. The major differences between them lie in their objectives, methodology, and application areas.
The main objective of a systematic review is to formulate a well-defined research question and use qualitative and quantitative methods to analyze all the available evidence attempting to answer the question. In contrast, narrative reviews can address one or more questions with a much broader scope. The efficacy of narrative reviews is irreplaceable in tracking the development of a scientific principle, or a clinical concept. This ability to conduct a wider exploration could be lost in the restrictive framework of a systematic review.
For systematic reviews, there are guidelines provided by the Cochrane Handbook, ROSES, and the PRISMA statement that can help determine the protocol, and methodology to be used. However, for narrative reviews, such standard guidelines do not exist. Although, there are recommendations available.
Systematic reviews comprise an explicit, transparent, and pre-specified methodology. The methodology followed in a systematic review is as follows,
A narrative review on the other hand does not have a strict protocol to be followed. The design of the review depends on its author and the objectives of the review. As yet, there is no consensus on the standard structure of a narrative review. The preferred approach is the IMRAD (Introduction, Methods, Results, and Discussion) [2]. Apart from the author’s preferences, a narrative review structure must respect the journal style and conventions followed in the respective field.
Narrative reviews are aimed at identifying and summarizing what has previously been published. Their general applications include exploring existing debates, the appraisal of previous studies conducted on a certain topic, identifying knowledge gaps, and speculating on the latest interventions available. They are also used to track and report on changes that have occurred in an existing field of research. The main purpose is to deepen the understanding in a certain research area. The results of a systematic review provide the most valid evidence to guide clinical decision-making and inform policy development [1]. They have now become the gold standard in evidence-based medicine [1].
Although both types of reviews come with their own benefits and limitations, researchers should carefully consider the differences between them before making a decision on which review type to use.
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Systematic review methods have influenced many other review types, including the traditional literature review. Covidence is a web-based tool that saves you time at the screening, selection, data extraction and quality assessment stages of your systematic review. It supports easy collaboration across teams and provides a clear overview of task ...
The difference between literature review and systematic review comes back to the initial research question. Whereas the systematic review is very specific and focused, the standard literature review is much more general. The components of a literature review, for example, are similar to any other research paper.
Literature Review: Systematic Review: Definition. Qualitatively summarizes evidence on a topic using informal or subjective methods to collect and interpret studies: High-level overview of primary research on a focused question that identifies, selects, synthesizes, and appraises all high quality research evidence to that question ...
The methodology involved in a literature review is less complicated and requires a lower degree of planning. For a systematic review, the planning is extensive and requires defining robust pre-specified protocols. It first starts with formulating the research question and scope of the research. The PICO's approach (population, intervention ...
The following table provides a detailed explanation as well as the differences between systematic and literature reviews. Kysh, Lynn (2013): Difference between a systematic review and a literature review.
Systematic Review vs. Literature Review. It is common to confuse systematic and literature reviews as both are used to provide a summary of the existent literature or research on a specific topic. Even with this common ground, both types vary significantly. Please review the following chart (and its corresponding poster linked below) for the ...
A preliminary review, which can often result in a full systematic review, to understand the available research literature, is usually time or scope limited. Complies evidence from multiple reviews and does not search for primary studies. 3. Identifying a topic and developing inclusion/exclusion criteria.
A systematic review collects secondary data, and is a synthesis of all available, relevant evidence which brings together all existing primary studies for review (Cochrane 2016). A systematic review differs from other types of literature review in several major ways.
Systematic review vs. literature review. 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.
What is a literature review? Definition: A literature review is a systematic examination and synthesis of existing scholarly research on a specific topic or subject. Purpose: It serves to provide a comprehensive overview of the current state of knowledge within a particular field. Analysis: Involves critically evaluating and summarizing key findings, methodologies, and debates found in ...
In contrast, a systematic literature review might be conducted by one person. Overall, while a systematic review must comply with set standards, you would expect any review called a systematic literature review to strive to be quite comprehensive. A systematic literature review would contrast with what is sometimes called a narrative or ...
A systematic review collects secondary data, and is a synthesis of all available, relevant evidence which brings together all existing primary studies for review (Cochrane 2016). A systematic review differs from other types of literature review in several major ways.
Literature reviews establish the foundation of academic inquires. However, in the planning field, we lack rigorous systematic reviews. In this article, through a systematic search on the methodology of literature review, we categorize a typology of literature reviews, discuss steps in conducting a systematic literature review, and provide suggestions on how to enhance rigor in literature ...
Acommon type of submission at any Journal is a review of the published information related to a topic.These are often returned to their authors without review, usually because they are literature reviews rather than systematic reviews. There is a big difference between the two (Table 1).Here, we summarise the differences, how they are used in academic work, and why a general literature review ...
A systematic review is a scholarly synthesis of the evidence on a clearly presented topic using critical methods to identify, define and assess research on the topic. [1] A systematic review extracts and interprets data from published studies on the topic (in the scientific literature), then analyzes, describes, critically appraises and summarizes interpretations into a refined evidence-based ...
A systematic review follows explicit methodology to answer a well-defined research question by searching the literature comprehensively, evaluating the quantity and quality of research evidence rigorously, and analyzing the evidence to synthesize an answer to the research question. The evidence gathered in systematic reviews can be qualitative ...
A systematic literature review aims to comprehensively identify, select, and analyze all relevant studies on a specific research question using a rigorous methodology. It summarizes findings qualitatively. On the other hand, a meta-analysis is a statistical technique applied within a systematic review.
A literature review is probably the most common academic writing activity that is performed by scholars and graduate students. Imel [] identified a literature review as being either part of a larger study or as a research effort on its own.As a part of a larger study, Imel [] identified the literature is "the foundation for the study."It has been suggested that the literature review for a ...
The evidence pyramid (image above) visually depicts the evidential strength of different research designs. Studies with the highest internal validity, characterized by a high degree of quantitative analysis, review, analysis, and stringent scientific methodology, are at the top of the pyramid.
A literature review is a systematic way of collecting and synthesizing previous research (Snyder, 2019).An integrative literature review provides an integration of the current state of knowledge as a way of generating new knowledge (Holton, 2002).HRDR is labeling Integrative Literature Review as one of the journal's four non-empirical research article types as in theory and conceptual ...
There are many different types of literature reviews from traditional literature reviews to rigorous systematic reviews. Each has its own methodology. Please review resources on this page and familiarize yourself with the task, commitment, and purpose of each before trying to decide on the type of review best fitting your research question.
Systematic reviews in healthcare began to appear in publication in the 1970s and 1980s [1, 2].With the emergence of groups such as Cochrane and the Joanna Briggs Institute (JBI) in the 1990s [], reviews have exploded in popularity both in terms of the number conducted [], and their uptake to inform policy and practice.Today, systematic reviews are conducted for a wide range of purposes across ...
Ideally, a literature review should not identify as a major research gap an issue that has just been addressed in a series of papers in press (the same applies, of course, to older, overlooked studies ("sleeping beauties" )). This implies that literature reviewers would do well to keep an eye on electronic lists of papers in press, given ...
Therefore, the fundamental idea of a systematic literature review is that the review is replicable, meaning that another researcher can replicate the review process and arrive at the same set of evidence and the same conclusion. A systematic review includes an exhaustive search of designated databases (e.g. Web of Science and Scopus ...
When the word "review" alone is used to describe a research paper, the first thing that should come to mind is that it is a literature review. Almost every researcher starts off their career with literature reviews. To know the difference between a systematic review and a literature review, read on here. Traditional literature reviews are ...
Their systematic review concluded that what is needed is a stronger foundation of objective data-driven evidence and an automated decision-making tool for studying crash occurrence mitigation, thus enabling a safer road network system. Shool et al. (Citation 2024) conducted a systematic review and followed it with a meta-analysis on the ...