Literature Review

Literature Review

A literature review is not a summary parade — it is a critical, synthesising argument that demonstrates your command of the existing discourse and carves out the intellectual space your own research will occupy.

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Types of Literature Reviews

| Type | Purpose | Structure | |---|---|---| | Narrative Review | Broad synthesis and critical discussion of a field | Thematic or chronological; author-led | | Systematic Review | Exhaustive, reproducible survey of all evidence on a question | PRISMA protocol; strict inclusion/exclusion | | Scoping Review | Map the breadth of a topic; identify gaps | PRISMA-ScR; broader scope than systematic | | Literature Review Chapter (Dissertation) | Contextualise your own study; establish the gap | Funnel structure: broad → specific | | Integrative Review | Synthesise diverse methodologies | Theory-building focus | | Critical Review | Evaluate quality and contribution of a body of work | Argumentative; includes critique of methods |

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Narrative Literature Review — Structure

The Funnel Model (Standard Dissertation Chapter)

┌─────────────────────────────────────┐
│  Broad theoretical context          │  (What does the field broadly know?)
├─────────────────────────────────────┤
│  Key themes and debates             │  (What are the major arguments?)
├─────────────────────────────────────┤
│  Specific studies relevant to you   │  (What evidence exists closest to your topic?)
├─────────────────────────────────────┤
│  Research gap                       │  (What is still unknown or contested?)
└─────────────────────────────────────┘
│  Your study's positioning           │  (How does your study address this gap?)
└─────────────────────────────────────┘

Thematic Organisation (Preferred over Chronological)

Organise sources by theme/concept, not by author or publication date:

• Group sources that agree with each other
• Group sources that disagree or complicate each other
• Each theme = one section with its own mini-argument

Avoid the "annotated bibliography" mistake: writing a paragraph per source in isolation. Synthesis means showing how sources talk to each other.

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Systematic Review — PRISMA Framework

Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) is the international standard for systematic reviews.

PRISMA Phases

1. Identification: Search all relevant databases (PubMed, Web of Science, Scopus, JSTOR, etc.) using pre-defined search strings
2. Screening (Title & Abstract): Remove duplicates; screen by title and abstract for relevance
3. Eligibility (Full Text): Assess remaining papers against formal inclusion/exclusion criteria
4. Included: Final set of papers that meet all criteria

Documentation Requirements

• Search strategy: Must be fully reproducible — list every database, every search term, Boolean operators used, date range
• PRISMA Flow Diagram: Visual representation of papers at each stage (required in most journals)
• Inclusion criteria: Population, Intervention/exposure, Comparison, Outcome (PICO framework)
• Exclusion criteria: State why papers were excluded (wrong population, methodology, date, language)
• Data extraction table: Standardised extraction of key variables from each included study

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The Synthesis vs. Summary Distinction

| Summary | Synthesis | |---|---| | Reports what one source says | Connects what multiple sources say to each other | | Source-by-source structure | Theme-by-theme structure | | "Smith (2019) found that X" | "While Smith (2019) found X, Jones (2021) complicates this by demonstrating Y, a tension also observed by Lee (2022)" | | Descriptive | Analytical and evaluative |

The test: Can you remove any one source from your paragraph without breaking the logic? If yes — you are summarising, not synthesising.

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Identifying and Writing the Research Gap

The research gap is the most important sentence in your literature review — it justifies your entire study.

Types of Research Gaps

• Empirical gap: Topic has not been studied in a specific population, context, or time period
• Methodological gap: Prior studies use weak or limited methods; a more rigorous approach is needed
• Theoretical gap: Existing theories do not explain a particular phenomenon
• Geographical gap: Research exists in Western contexts but not in your regional context
• Temporal gap: The field has not been updated since significant changes occurred

Gap-Signalling Phrases

• "To date, there has been little agreement on..."
• "Previous studies have failed to specify..."
• "What is not yet clear is the impact of X on..."
• "No study has examined X in the context of..."
• "While X has been extensively studied, Y remains largely unexplored..."
• "Existing research is limited by its reliance on..."
• "There remains a paucity of longitudinal evidence on..."

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Critical Analysis in the Literature Review

Do NOT simply report findings — evaluate them:

• Sample limitations: Small samples, unrepresentative populations, self-selected groups
• Methodological weaknesses: Lack of control group, self-report bias, cross-sectional design
• Theoretical limitations: Assumes Western frameworks that may not apply universally
• Temporal issues: Research is outdated; conditions have changed significantly
• Conflicting evidence: Sources contradict each other — note the conflict and analyse why

Critical Verbs for Evaluation

• challenges, problematises, overlooks, neglects, fails to account for, is limited by, underestimates, overgeneralises, does not distinguish between

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Synthesis Paragraph Structure

Topic sentence → State the theme or argument this paragraph addresses

Evidence 1 → Introduce first source and its finding (paraphrase + cite)

Evidence 2 → Introduce contrasting or supporting source (paraphrase + cite)

Analysis → What does this tension or agreement reveal? Why does it matter?

Link → Connect to the broader argument or bridge to the next theme

Example Synthesis Paragraph

> Organisational commitment has consistently been identified as a key predictor of employee retention (Meyer & Allen, 1991; Mowday et al., 1979). However, more recent empirical work suggests that the relationship is moderated by job autonomy and perceived organisational support (Eisenberger et al., 2020; Rhoades & Eisenberger, 2002). These findings complicate early models, which treated commitment as a relatively stable, individual-level disposition (Allen & Meyer, 1996), by demonstrating that structural and relational workplace factors play a significant role. The implication is that retention strategies focused purely on attitudinal change may be insufficient without corresponding changes to organisational conditions.

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Common Literature Review Mistakes

| Mistake | Fix | |---|---| | Annotated bibliography structure (one source per paragraph) | Restructure thematically; make sources speak to each other | | Quoting too heavily instead of synthesising | Paraphrase and attribute; reserve direct quotes for key definitions only | | Including outdated sources without acknowledging it | Note the date and explain why older foundational work is still relevant | | No critical evaluation — just description | Add evaluative language; note limitations of each study | | Missing the research gap | Explicitly state what is unknown; do not leave it implicit | | No clear organisation (sources listed randomly) | Use headings and thematic structure | | Including everything you read | Only include sources relevant to your specific research question |

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Review Type Decision Guide

Choosing Your Review Methodology

What is your research question?
  ├─ Broad overview of a field? → Narrative Review
  ├─ Specific, answerable PICO question? → Systematic Review
  ├─ Mapping extent of evidence? → Scoping Review
  ├─ Quantitative synthesis of effect sizes? → Meta-Analysis
  └─ Mixed methods synthesis? → Mixed Methods Review

Narrative Review

When to use: Broad topics, introductory sections, theoretical discussions. Advantages: Flexible, covers wide ground, expert interpretation valued. Limitations: Prone to selection bias; less replicable. Reporting: No formal protocol required; cite key sources; acknowledge limitations.

Systematic Review

When to use: Specific clinical or empirical question; evidence synthesis for policy. Required elements:

1. Pre-specified protocol (register on PROSPERO before searching)
2. Comprehensive search strategy (multiple databases, grey literature)
3. Documented inclusion/exclusion criteria
4. Quality assessment of included studies
5. PRISMA reporting (flow diagram + 27-item checklist)

Search strategy template:

("keyword 1" OR "synonym 1") AND
("keyword 2" OR "synonym 2") AND
("keyword 3" OR "synonym 3")

Run in: PubMed, Embase, Cochrane Library, PsycINFO (add field-specific databases).

Scoping Review

When to use: Emerging field; map concepts and evidence types; identify research gaps. Different from systematic review: No quality assessment; broader inclusion. Report with: PRISMA-ScR (Scoping Review extension).

Meta-Analysis

When to use: Sufficient homogeneous studies exist; quantitative synthesis appropriate. Required: Effect sizes and variance measures from each study. Report: Pooled effect size with 95% CI, heterogeneity (I², τ²), funnel plot.

Synthesis vs. Summary

The central skill in literature reviewing is synthesis — making meaning across sources, not just describing them.

| Summary | Synthesis | |---------|-----------| | "Smith (2020) found X" | "Studies consistently show X (Smith, 2020; Jones, 2019)" | | Each paragraph = one paper | Each paragraph = one theme/finding | | Papers are described in sequence | Papers compared and contrasted | | Author's perspective is absent | Your analytical voice is present | | "Next, Lee (2021) argued..." | "This debate reflects..." |

Synthesis Sentence Starters

• "Taken together, these studies suggest..."
• "A consistent finding across the literature is..."
• "Contrasting explanations have been offered: [X], while [Y]..."
• "The evidence for X is mixed: [Smith] found Y, while [Jones] found Z..."
• "A gap in the existing research is..."

Research Gap Identification

After synthesising, explicitly identify gaps:

1. Population gaps: Studies focus on Western, WEIRD (Western, Educated, Industrialised, Rich, Democratic) samples
2. Methodological gaps: Mostly cross-sectional studies; no longitudinal data
3. Contextual gaps: No studies in low-income countries
4. Theoretical gaps: No studies testing [specific theory]
5. Temporal gaps: No studies since [major event]
6. Replication gaps: Key findings not independently replicated

Integration with Other Skills

• Register your review on PROSPERO first using preregistration-guide
• Use statistical-reporting for meta-analysis reporting
• Use figure-table-checker for PRISMA flow diagrams
• Use reference-verifier to validate all included study citations

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: muhammad1438
• Source: muhammad1438/academic-writer-skills
• License: MIT

Install and usage instructions live in the source repository linked above.