Definition · Plain-language
Narrative review
A narrative review is a flexible, qualitative survey of the published literature on a topic, organised and interpreted according to the author’s expert judgement rather than a fixed protocol.
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A flexible survey of a field
A narrative review gathers and discusses the existing literature on a topic to give the reader an overview of current understanding. Unlike a systematic review, it does not follow a rigid, pre-registered protocol; the author decides which sources to include and how to organise them, drawing on subject expertise. This flexibility lets a narrative review cover a broad or complex topic, weave together different strands of evidence, and provide background, theory and context. It is the form most commonly seen in textbook chapters, journal introductions and student literature reviews, and it remains a legitimate and valuable mode of synthesis when breadth and interpretation matter more than exhaustive coverage.
Strengths and limitations
The strength of a narrative review is its scope and interpretive freedom: an expert can synthesise a wide, heterogeneous literature, connect ideas across fields, and offer perspective that a tightly bounded systematic review cannot. The corresponding weakness is susceptibility to bias. Because the search is not exhaustive or documented and the selection rests on judgement, important studies can be missed and the author’s prior views can shape which evidence is foregrounded. The method is also hard to reproduce. These limits do not make narrative reviews wrong, but they mean their conclusions carry less evidential weight than those of a well-conducted systematic review.
When a narrative review is the right choice
A narrative review fits when the aim is to provide context, explore a broad or developing topic, build theory, or introduce a subject — not to deliver a definitive answer to a narrow, answerable question. It is appropriate for the background section of a paper, for a discursive overview, or where the literature is too diverse to pool. Even so, a narrative review benefits from borrowing systematic habits: searching several databases, being explicit about how sources were chosen, and acknowledging the limits of coverage. Doing so increases transparency without sacrificing the flexibility that makes the form useful.
Key facts
At a glance
- Definition: flexible, qualitative survey of the literature guided by expert judgement
- Also called: traditional review, literature review
- No protocol: selection and structure rest on the author, not a fixed method
- Strength: broad scope, interpretation and context across a wide field
- Limitation: open to selection bias and hard to reproduce
- Best for: background, overviews and broad or emerging topics
Common misconceptions
What people often get wrong
Often heard: A narrative review is just a lower-quality systematic review.
Actually: They serve different purposes. A systematic review answers a focused question with a reproducible protocol; a narrative review offers broad, interpretive coverage of a field. Each is valid for its aim — a narrative review is not a failed attempt at a systematic one.
Often heard: Narrative reviews do not need any search method at all.
Actually: Although they lack a formal protocol, good narrative reviews still search several databases and are transparent about how sources were selected. Documenting the approach reduces bias and increases the review’s credibility.
Often heard: A narrative review can establish cause and effect as firmly as a systematic review.
Actually: Because its search is not exhaustive and its selection is judgement-based, a narrative review carries more risk of bias, so its conclusions are weaker evidence than those of a well-conducted systematic review or meta-analysis.
