Direct comparison
Systematic review vs scoping review — what is the difference?
A systematic review answers a focused question by appraising and synthesising the evidence; a scoping review maps the breadth of a body of literature. They share rigorous, transparent methods but have different aims, and each has its own PRISMA reporting guideline.
Side-by-side comparison
| Dimension | Systematic review | Scoping review |
|---|---|---|
| Primary aim | Answer a focused, specific question | Map the breadth of evidence on a broad topic |
| Typical question | Effectiveness / comparison (e.g. PICO-framed) | "What is known about...?" / what evidence exists |
| Protocol | Pre-registered protocol (e.g. PROSPERO) | Pre-defined protocol; PROSPERO does not register scoping reviews |
| Critical appraisal | Yes — risk-of-bias / quality assessment of studies | Usually not a formal aim — focus is on coverage |
| Synthesis | Narrative and often quantitative (meta-analysis) | Descriptive mapping and charting; usually no meta-analysis |
| Inclusion criteria | Narrow and tightly specified | Broader — by design, to capture range |
| Reporting guideline | PRISMA 2020 | PRISMA-ScR (extension for Scoping Reviews) |
| Output | An appraised answer plus, often, an effect estimate | A map of concepts, evidence types, and gaps |
| When to use | When a clear answerable question and appraisable studies exist | To scope a field, clarify concepts, or plan a future systematic review |
Common questions
FAQ
Is a scoping review just a less rigorous systematic review?+
No. Both use systematic, transparent, reproducible methods; they simply have different aims. A systematic review appraises and synthesises evidence to answer a focused question, whereas a scoping review maps the breadth of a topic and its gaps. Different purpose, not lower rigour.
Do scoping reviews include critical appraisal of studies?+
Usually not as a core aim. Because a scoping review seeks to map the range and nature of evidence rather than to answer an effectiveness question, formal risk-of-bias appraisal of each study is typically out of scope, though some reviews report it.
Which PRISMA guideline applies to each?+
Systematic reviews are reported using PRISMA 2020. Scoping reviews use PRISMA-ScR, the PRISMA extension for Scoping Reviews, which adapts the checklist to the mapping aim of a scoping review.
Can a scoping review lead to a systematic review?+
Yes — that is a common use. A scoping review can clarify concepts, definitions, and the volume and types of available evidence, helping a team decide whether a focused systematic review is feasible and how to frame its question.
