Academic Writing

What Is A Scoping Review

A scoping review maps the existing literature on a broad topic, identifying the types of studies available, their key characteristics, and research gaps. Unlike a systematic review that answers a specific question, a scoping review provides a broad overview. It's a valuable tool for researchers, policymakers, and practitioners seeking to understand the extent and nature of evidence in a particular field. This guide breaks down its purpose, process, and when to use it.

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Defining the Scoping Review: A Broad Brushstroke of Evidence

In the world of academic research, understanding the existing body of knowledge is crucial. When you need to get a sense of what's out there on a particular subject, especially if the research landscape is vast or ill-defined, a scoping review is your go-to method. Think of it as an exploratory map of the literature. Instead of trying to answer a very specific question, like a traditional systematic review might, a scoping review aims to identify, summarize, and disseminate the breadth of research activity on a topic. It's about understanding the 'what,' 'where,' and 'how much' of the evidence, rather than the 'how effective' or 'what is the best'.

The primary goal is to chart the key concepts, theories, sources of evidence, and findings within a research area. This is particularly useful when a topic is complex, has many different facets, or when the evidence base is expected to be heterogeneous. For instance, if you're interested in 'patient engagement in healthcare,' that's a broad umbrella. A scoping review could help you understand the different ways patient engagement is defined, measured, and studied across various healthcare settings and patient populations. It helps to clarify the scope of available research and can inform future research agendas or policy development.

Why Choose a Scoping Review? Its Unique Purpose

The decision to conduct a scoping review often stems from a need to clarify a concept, problem, or issue. It's a valuable first step when you're not sure about the nature or extent of the research. For example, a new intervention or a rapidly evolving field might have a scattered and diverse research base. A scoping review can help make sense of this by identifying the types of studies being conducted, the populations involved, and the outcomes measured. It's less about synthesizing findings to draw definitive conclusions and more about providing a comprehensive overview of the research landscape.

Consider a situation where a government agency is considering a new public health initiative. They might not know what interventions have been tried, what populations have been targeted, or what outcomes have been reported. A scoping review could quickly provide this overview, highlighting what is known and, perhaps more importantly, what is not known. This can then guide more focused research or policy decisions. It's a flexible and iterative approach, allowing for the inclusion of a wide range of study designs and sources of evidence, which might not be feasible in a more narrowly focused systematic review.

The Five Stages of a Scoping Review: A Structured Approach

While scoping reviews are known for their flexibility, they still follow a structured process to ensure rigor and reproducibility. The widely accepted framework, developed by Arksey and O'Malley and later refined by Levac, Colquhoun, and O'Brien, outlines five key stages:

Identifying the research question(s): This is broader than in a systematic review, focusing on the scope of the evidence rather than a single, answerable question.
Identifying relevant studies: This involves a comprehensive search strategy across multiple databases and other sources to capture a wide range of literature.
Selecting studies: Based on pre-defined inclusion and exclusion criteria, relevant studies are chosen for inclusion.
Charting the data: Key information from each study is extracted and summarized in a structured way, often using a data extraction form.
Collating, summarizing, and reporting the results: The extracted data is analyzed and presented to provide an overview of the research area, highlighting key themes, gaps, and characteristics of the included studies.

A crucial addition to this framework is the sixth stage, often incorporated in practice: 'Consultation.' This involves engaging with stakeholders, such as patients, policymakers, or clinicians, to help refine the research question, interpret findings, and ensure the review's relevance and applicability. This consultative element can significantly enhance the impact and utility of the scoping review.

Scoping Review vs. Systematic Review: Knowing the Difference

It's easy to confuse scoping reviews with systematic reviews, as both involve a rigorous search and appraisal of literature. However, their fundamental purposes and methodologies diverge significantly. A systematic review is designed to answer a specific, focused research question (e.g., 'What is the effectiveness of cognitive behavioral therapy for depression in adolescents?'). It typically involves a critical appraisal of the quality of included studies and a meta-analysis or narrative synthesis of findings to provide a definitive answer or conclusion.

In contrast, a scoping review is broader in scope and aims to map the literature. It doesn't typically involve a critical appraisal of study quality, as the goal isn't to assess the validity of individual studies but rather to understand the range of research that exists. The output of a scoping review is a description of the volume, nature, and sources of research, often identifying gaps in the literature. Think of it this way: a systematic review is like a deep dive into a specific well to extract a precise amount of water, while a scoping review is like surveying the entire aquifer to understand its boundaries and characteristics.

Scoping Review: Maps the breadth of literature, identifies research gaps, explores concepts, flexible inclusion criteria, no quality appraisal.
Systematic Review: Answers a specific question, critically appraises study quality, synthesizes findings, often includes meta-analysis, strict inclusion criteria.

When is a Scoping Review the Right Choice?

Several scenarios warrant the use of a scoping review. If you're exploring a new or emerging area where the research is likely to be diverse and unorganized, a scoping review is ideal. It can help to define the scope of the problem and identify key terms and concepts used in the literature. For instance, if a new technology like AI in medical diagnostics is rapidly developing, a scoping review can map out the initial research, identifying different applications, ethical considerations, and early outcomes.

It's also a good choice when you need to understand the 'state of the art' in a field, identify relevant populations or settings for research, or determine the types of evidence available. For example, a research team might want to know what interventions have been studied for a rare disease. A scoping review can quickly reveal if there are any studies at all, what types of studies they are, and what outcomes have been reported, guiding their subsequent research efforts. It can also be used to inform the development of systematic reviews by identifying the body of literature that could be systematically appraised.

Key Considerations for Conducting a Scoping Review

Conducting a thorough scoping review requires careful planning and execution. Developing a clear, albeit broad, research question is the first step. This question guides the entire process, from the search strategy to the data charting. For example, a question might be: 'What interventions have been studied to promote physical activity in older adults living in community settings?'

The search strategy needs to be comprehensive, casting a wide net to capture as much relevant literature as possible. This often involves searching multiple databases (like PubMed, Scopus, Web of Science), grey literature (reports, conference proceedings), and even hand-searching reference lists of key articles. The inclusion and exclusion criteria, while broader than for a systematic review, still need to be clearly defined to ensure consistency in study selection. For our physical activity example, criteria might include studies published in English, focusing on adults aged 65+, and involving community-dwelling individuals.

Data charting is another critical phase. Researchers typically develop a detailed data extraction form to capture relevant information such as study design, participants, interventions, outcomes, and publication year. This systematic extraction allows for a clear summary of the findings. Finally, the reporting of results should be transparent, detailing the process and presenting a clear overview of the literature, including any identified gaps or areas for future research. The Joanna Briggs Institute (JBI) and the PRISMA Extension for Scoping Reviews (PRISMA-ScR) provide valuable guidelines for reporting.

Example: Scoping Review on Social Media Use and Mental Health in Adolescents

Imagine a research team wants to understand the landscape of research on social media use and mental health in adolescents. A scoping review would be appropriate here because the topic is broad, with many different platforms, types of social media use (passive vs. active), and mental health outcomes (anxiety, depression, body image, etc.). The research question might be: 'What is the scope of research examining the relationship between social media use and mental health outcomes in adolescents aged 10-19?' The review would involve searching databases for studies on social media and adolescent mental health. They would chart data on the specific social media platforms studied (e.g., Instagram, TikTok), the age ranges of adolescents, the mental health outcomes measured (e.g., self-esteem, sleep quality, cyberbullying), and the study designs used (e.g., cross-sectional, longitudinal). The results would map out which aspects of social media use have been most studied, which mental health outcomes are most frequently examined, and identify areas where research is lacking, perhaps highlighting a need for more longitudinal studies or research on specific platforms.

The Impact and Future of Scoping Reviews

Scoping reviews have gained significant traction in various disciplines, from healthcare and social sciences to education and environmental studies. Their ability to provide a broad overview of a research area makes them essential for policymakers, practitioners, and researchers alike. They can help to synthesize disparate findings, identify emerging trends, and highlight areas where evidence is scarce, thereby guiding the allocation of resources for future research and intervention development.

As research continues to grow and diversify, the utility of scoping reviews will only increase. They serve as a critical first step in understanding complex issues and can lay the groundwork for more focused, in-depth systematic reviews or primary research. By providing a clear map of the evidence, scoping reviews empower stakeholders to make informed decisions and advance knowledge in their respective fields.

FAQs

What is the main difference between a scoping review and a systematic review?

The primary difference lies in their objectives. A scoping review aims to map the breadth of literature on a topic, identifying key concepts, research gaps, and types of evidence available. It's exploratory. A systematic review, on the other hand, aims to answer a specific, focused research question by critically appraising and synthesizing the findings of high-quality studies.

Does a scoping review involve appraising the quality of studies?

Generally, no. While a scoping review involves a rigorous search and selection process, it typically does not include a critical appraisal of the methodological quality of the included studies. The focus is on the scope and nature of the research, not on assessing the validity of individual study findings.

When should I consider conducting a scoping review?

You should consider a scoping review when you need to understand the extent of research on a broad or complex topic, when the research area is new or rapidly evolving, when you want to identify key concepts or theories, or when you need to determine the types of evidence available and identify research gaps. It's often a good first step before undertaking a more focused systematic review.

What are the key stages of a scoping review?

The commonly accepted stages, based on the Arksey and O'Malley framework, are: identifying the research question, identifying relevant studies, selecting studies, charting the data, and collating, summarizing, and reporting the results. Many also include a consultation stage with stakeholders.

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