A systematic review answers a focused question by identifying, appraising and synthesising all the relevant studies using an explicit, reproducible method. It is the gold standard of evidence synthesis in health, nursing and the social sciences. This complete UK guide explains how a systematic review differs from a literature review, the PRISMA process, how to search and appraise studies, and how to synthesise findings.
What Is a Systematic Review?
A systematic review uses a transparent, reproducible method to find and combine all studies relevant to a specific question. Its defining feature is rigour: every step — search, selection, appraisal, synthesis — is pre-planned and documented.
Systematic vs Literature Review
A literature review summarises and discusses the literature, often selectively. A systematic review follows a strict protocol to minimise bias and is reproducible. See our literature review guide for the difference.
The PRISMA Process
Most reviews follow PRISMA and report study flow through four stages: identification, screening, eligibility and inclusion. A PRISMA flow diagram shows how many records were found, screened, excluded and finally included, with reasons.
Searching and Selecting Studies
Define inclusion and exclusion criteria in advance, search multiple databases with documented search terms, then screen by title, abstract and full text against your criteria. A focused question — often framed with PICO — drives the whole search.
Appraising and Synthesising
Critically appraise the quality of included studies (using tools such as CASP), then synthesise the findings — narratively or, where appropriate, through meta-analysis. The aim is a balanced, evidence-weighted answer to your question.
Common Mistakes and Tips
✓ No pre-defined protocol or criteria.
✓ A search that is not reproducible.
✓ Skipping quality appraisal.
✓ Listing studies instead of synthesising. Tip: plan the protocol first and document every step.
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Frequently Asked Questions
What is a systematic review?
A review that uses an explicit, reproducible method to find, appraise and synthesise all relevant studies on a question.
How is it different from a literature review?
A systematic review follows a strict, reproducible protocol to minimise bias; a literature review is more selective.
What is PRISMA?
A reporting framework with a flow diagram covering identification, screening, eligibility and inclusion.
What is PICO?
A framework for focusing a clinical question: Population, Intervention, Comparison, Outcome.
How do I appraise study quality?
Use validated tools such as CASP to assess each included study.
What is meta-analysis?
A statistical method for combining results across studies, used where data allow.
How many databases should I search?
Several relevant ones, with documented search terms, to ensure comprehensiveness.
Do I need a protocol?
Yes — a pre-defined protocol is central to a systematic review.
Related Study Guides
How to Write a Literature Review • How to Write a Critical Appraisal • How to Write a Research Question • How to Write a Nursing Essay
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