Literature review vs systematic review
Both synthesise published research, but they answer different needs. A (narrative) literature review maps what’s known on a topic, chosen by your judgement. A systematic review answers one focused question with a pre-registered, exhaustive, reproducible method — so anyone repeating it would find the same studies. One trades rigour for breadth; the other trades breadth for rigour.
Side by side
| Literature review | Systematic review | |
|---|---|---|
| Goal | Map / frame a field | Answer one focused question |
| Search | Selective, author’s judgement | Exhaustive, documented, reproducible |
| Protocol | Flexible, none required | Pre-registered (e.g. PROSPERO) |
| Selection | Author decides | Explicit inclusion/exclusion criteria, dual screening |
| Reporting | Narrative | PRISMA (incl. flow diagram) |
| Effort | One person, flexible | A team, many months |
When to use which
- Narrative literature review — mapping a broad area, building theoretical background, or framing a thesis chapter. This is what most graduate students write.
- Systematic review — a narrow, answerable question (often an intervention’s effect) needing a defensible, unbiased synthesis of all the evidence.
There are also other review types in between — scoping, rapid, integrative — when neither extreme fits.
What the systematic review adds
The rigour lives in three things: a pre-registered protocol (PROSPERO) so the question is fixed before you see results; a documented multi-database search with explicit criteria and dual screening; and PRISMA reporting, including the flow diagram that tracks every record from identification to inclusion. That’s what makes it reproducible — and far more work.
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Frequently asked questions
What's the difference?
A literature review surveys a topic by the author's judgement; a systematic review answers a focused question with a pre-registered, reproducible method.
When should I do a systematic review?
For a narrow, answerable question needing a defensible, unbiased synthesis of all the evidence — not for broad background framing.
Is a systematic review harder?
Yes — protocol, documented search, dual screening, appraisal, and PRISMA reporting; usually a team over many months.
What are PRISMA and PROSPERO?
PRISMA is the reporting standard (incl. the flow diagram); PROSPERO is the register where protocols are recorded in advance.