literature-review
Conducting a Literature Review
Overview
A literature review systematically identifies, appraises, and synthesizes published evidence on a defined research question. The method ranges from informal narrative reviews to highly structured systematic reviews with meta-analysis. Choosing the correct review type, building a reproducible search strategy, and applying transparent inclusion/exclusion criteria are the foundational decisions that determine whether a review can be trusted and published in a high-impact journal. This guide covers the full workflow from question formulation to synthesis and reporting.
Key Concepts
1. Review Type Taxonomy
| Review Type | Definition | When to Use | Time Required |
|---|---|---|---|
| Narrative review | Selective, expert-curated synthesis; no protocol; no PRISMA | Introducing a topic; describing mechanistic background | Days to weeks |
| Scoping review | Comprehensive mapping of evidence landscape; PRISMA-ScR; no quality appraisal | Understand what evidence exists before committing to systematic review | Weeks to months |
| Systematic review | Exhaustive search; predefined protocol (PROSPERO); quality appraisal; PRISMA | Answer a specific clinical/scientific question with highest rigor | Months to years |
| Meta-analysis | Systematic review + quantitative pooling of effect estimates | Quantify pooled effect size and heterogeneity across studies | Months to years |
| Umbrella review | Systematic review of existing systematic reviews | Synthesize evidence from multiple reviews on one topic | Months |
| Rapid review | Streamlined systematic review with time-limited methods | Time-sensitive policy or clinical decisions | Weeks |
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