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Scoping reviews

Information describing scoping reviews and suitability for your topic, and resources to aid in conducting one.

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About scoping reviews

Definition

A scoping review maps existing literature on a broad topic, identifies key concepts, research gaps, and types of evidence by systematically searching for and organizing relevant literature, and assesses available evidence to guide future research directions.

Unlike systematic reviews, scoping reviews do not aim to answer specific questions or critically evaluate study quality.

What are scoping reviews? (5:58 min) by JBI (YouTube)

Further reading

Munn, Z., Pollock, D., Khalil, H., Alexander, L., Mclnerney, P., Godfrey, C. M., Peters, M., & Tricco, A. C. (2022). What are scoping reviews? Providing a formal definition of scoping reviews as a type of evidence synthesis. JBI Evidence Synthesis, 20(4), 950–952. https://doi.org/10.11124/JBIES-21-00483

Why do a scoping review?

Common reasons for conducting a scoping review

  1. To identify the types of available evidence in a given field
  2. To identify and analyze knowledge gaps
  3. To clarify key concepts and definitions in the literature
  4. To examine how research is conducted on a certain topic
  5. To identify key characteristics or factors related to a concept
  6. As a precursor to a systematic review

When not to do a scoping review

  1. If a systematic review already exists on the topic
  2. If the goal is to determine the effectiveness of an intervention
Reference

Munn, Z., Peters, M. D. J., Stern, C., Tufanaru, C., McArthur, A., & Aromataris, E. (2018). Systematic review or scoping review? Guidance for authors when choosing between a systematic or scoping review approach. BMC Medical Research Methodology, 18(1), 143-149. https://doi.org/10.1186/s12874-018-0611-x

Similarities with systematic reviews

A scoping review shares the following characteristics with a systematic review:

  • Protocol development
  • Adherence to accepted guidelines
  • Adherence to PRISMA for reporting
  • Use of complex, systematic search techniques
  • Use of rigorous and transparent methods to comprehensively identify and analyse relevant literature
  • Requiring multiple team members for independent screening and data extraction

Differences to systematic reviews

A scoping review differs from a systematic review in several key ways:

  Scoping review Systematic review
Purpose Provides literature overview, identifies research gaps, and defines boundaries. Synthesises research to guide clinical decisions.
Focus Addresses broad questions without critical appraisal. Focuses on a specific question with critical appraisal.
Outcome Gives a descriptive overview without decision statements or meta-analysis. Produces evidence, may include meta-analysis, to guide practice.
Scope Includes various study designs, not limited to interventions. Focuses on specific interventions, collating evidence from fewer studies.

What type of review is right for you?

Types of evidence synthesis

Evidence synthesis refers to any method of identifying, selecting, and combining results from multiple studies. Types of evidence synthesis include: 

Literature (Narrative) Review

A broad term referring to reviews with a wide scope and non-standardized methodology.

  • Search strategies, comprehensiveness, and time range covered vary and do not follow an established protocol.

Rapid Review

Applies systematic review methodology within a time-constrained setting.

Scoping Review or Systematic Map

Systematically and transparently collects and categorizes existing evidence on a broad topic or set of research questions.

Umbrella Review

Reviews other systematic reviews on a topic.

  • Often defines a broader question than is typical of a traditional systematic review.
  • Most useful when there are competing interventions to consider.

Systematic Review

A methodical and comprehensive literature synthesis focused on a well-formulated research question.

  • Aims to identify and synthesize all of the scholarly research on a particular topic, including both published and unpublished studies.
  • Conducted in an unbiased, reproducible way to provide evidence for practice and policy-making and to identify gaps in research.
  • May involve a meta-analysis.
  • Much more time-intensive than traditional literature reviews.

Meta-Analysis

A statistical technique for combining the findings from disparate quantitative studies.

  • Uses statistical methods to objectively evaluate, synthesize, and summarize results.
  • May be conducted independently or as part of a systematic review

"What type of review is right for you?" by Cornell University Library is licensed under CC BY 4.0

Further reading

Grant, M. J., & Booth, A. (2009). A typology of reviews: an analysis of 14 review types and associated methodologies. Health Information & Libraries Journal, 26(2), 91-108. https://doi.org/10.1111/j.1471-1842.2009.00848.x

Review methodology decision tree

Cornell University Library has developed a decision tree that assists in identifying the types of reviews.

Decision tree: text version

Do you want to gather all the evidence on a particular research topic?

No: Do a Literature (Narrative) Review.

Yes: Do you have 3 or more people to work on the review?

No: More intensive reviews usually require a multi-person team for unbiased article screening.

Yes: Do you have 12–18 months to complete a review?

No: Do a Rapid Review.

Yes: Do you have a broad topic or multiple research questions?

Yes: Do a Scoping Review.

No: Do you want to review other published systematic reviews on your topic?

Yes: Do an Umbrella Review.

No: Do you have a well-formulated research question?

No: Systematic reviews are conducted in an unbiased, reproducible way to provide evidence for practice and policy-making and to identify gaps in research. They require a well-formulated research question.

Yes: Do a Systematic Review.

Will you use statistical methods to objectively evaluate, synthesize, and summarize results?  

No: A meta-analysis will not be needed.

Yes: Do a Meta-Analysis.

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