literature-synthesis

# Literature Synthesis for Qualitative Researchers Synthesis means more than summarizing articles: you **compare, contrast, integrate, and evaluate** patterns across a body of work to produce new insight—whether that is a gap map, a theory critique, or a higher-order interpretive synthesis. ## Types of reviews - **Narrative review:** Expert-led, flexible scope; strong for framing fields; risk of selection bias if unstructured. - **Systematic review:** Pre-specified question, explicit search, screening, appraisal, synthesis—minimizes ad hoc cherry-picking. - **Scoping review:** Maps breadth of concepts, sources, and gaps when the field is diffuse. - **Meta-synthesis / qualitative evidence synthesis:** Integrates findings across qualitative primary studies (e.g., meta-ethnography, thematic synthesis, meta-aggregative approaches in some health traditions). ## Search strategy development Translate your question into **PICOS-like** elements adapted for qualitative work (population, phenomenon, context). Use controlled vocabulary + free-text; document databases, date limits, language limits, and grey literature sources. Save reproducible search strings. ## PRISMA for systematic reviews PRISMA flow diagrams and checklists target systematic reviews broadly. For qualitative systematic reviews, use extensions/guidance where available (e.g., ENTREQ reporting guidance for qualitative evidence syntheses—verify current preferred reporting standards for your discipline). ## Qualitative meta-synthesis approaches **Meta-ethnography (Noblit & Hare):** - Reciprocal translation, refutational synthesis, line-of-argument synthesis. - Aims to produce **higher-order interpretations**, not just pooled themes. **Sandelowski & Barroso’s meta-summary (quantitative-leaning facet):** - Extract findings statements and sometimes frequency-qualify them—useful when discipline demands structured outputs; interpretive depth varies. Choose a method that matches your epistemology (interpretive vs aggregative). ## Synthesis matrices Build a matrix: rows as studies; columns as constructs, contexts, methods, findings, limitations. Color-code **agreements, tensions, silences**. Matrices reveal **contradictions** worth theorizing. ## Writing the synthesis Structure by **themes** or **analytic constructs**, not by “Article A, Article B.” For each theme: - Define it. - Show cross-study evidence. - Note methodological strengths/weaknesses influencing confidence. - State what remains unknown. ## Gap identification Distinguish **empirical gaps** (no studies in context X) from **theoretical gaps** (unexplained mechanisms) from **method gaps** (weak designs dominating a topic). ## Grounded theory caution Classic GT delays substantive-area literature until later analytic stages. A standalone literature synthesis skill is for **literature-first projects** (reviews, proposals) or **post-emergence integration**—do not use it to smuggle forcing into early GT coding. ## Checklist - [ ] Review type matches question and timeline. - [ ] Search reproducible; screening documented. - [ ] Quality appraisal method chosen and applied consistently. - [ ] Synthesis method matches paradigm (interpretive vs aggregative). - [ ] Reporting guideline selected (PRISMA/ENTREQ/etc. as appropriate). ## References (starting points) - Noblit, G. W., & Hare, R. D. *Meta-ethnography: Synthesizing qualitative studies*. - Gough, D., Oliver, S., & Thomas, J. *An introduction to systematic reviews* (2nd ed.). - Sandelowski, M., & Barroso, J. *Handbook for synthesizing qualitative research*.