What is the difference between summary and synthesis?

A summary reports each source on its own ('Author A found X; Author B found Y'). Synthesis combines sources around a theme to show the pattern ('On X, most studies find..., but a minority report..., leaving Y unresolved'). Synthesis is what a literature review is supposed to do.

How do I build a synthesis matrix?

List sources down the side and the themes you keep noticing across the column headers. For each source, summarise its take on each theme in the relevant cell, plus its method and your own critical note. Then read column by column and write a paragraph per theme describing agreement, disagreement, and gaps.

What columns should a synthesis matrix have?

At minimum: a citation column, a column per major theme or concept, and a notes column for methodology and your critical stance. Some researchers add columns for sample, design, and key finding so the matrix doubles as an extraction table.

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The synthesis matrix: how to synthesize, not summarize

Q: What is a synthesis matrix?

A synthesis matrix is a grid with your sources as rows and your key themes or concepts as columns. Filling each cell with what a source says about a theme lets you read down a column to see what the whole field says about that theme — which is synthesis, rather than summarizing each source in turn.

By Dr. Rafiq Muhammad, MD, PhD · Updated June 2026

A synthesis matrix is a simple grid — sources down the side, themes across the top. Once it’s filled in, you read down a column to see what the whole field says about one theme. That single move — reading down themes instead of across individual papers — is the difference between synthesizing and merely summarizing, and it’s the biggest upgrade most literature reviews need.

Summary vs synthesis

Summary (what to avoid): “Smith (2020) found X. Jones (2021) found Y. Lee (2022) found Z.” A list. Synthesis (the goal): “On X, most studies converge… though Lee’s longitudinal data complicate this, suggesting the effect fades over time — a tension the field hasn’t resolved.” The matrix is what makes the second kind of sentence easy to write.

What it looks like

Source	Theme A: …	Theme B: …	Method / notes
Smith 2020	finding on A	—	RCT; small n
Jones 2021	finding on A	finding on B	survey; contradicts Smith
Lee 2022	—	finding on B	longitudinal; strong

Then write by column: one paragraph per theme (column), describing where sources agree, where they conflict, and what’s missing. Your review’s structure falls out of the columns — organised by theme, not author.

How to build one

List your selected sources down the rows (citation in the first column).
Add a column for each major theme/concept you keep noticing.
In each cell, note what that source says about that theme — plus a notes column for method and your critical stance.
Read column by column; each becomes a synthesis paragraph.

The free Lit Review Synthesizer builds this matrix from per-paper cards and surfaces where the field agrees and conflicts; the Readiness Check confirms your matrix is in place before you write.

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A ready-to-use synthesis matrix, a per-source extraction template, and a structure outline from Literature Review Simplified. We’ll email you the download link.

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Frequently asked questions

What is a synthesis matrix?

A grid of sources (rows) × themes (columns); reading down a column shows what the field says about a theme — that’s synthesis.

Summary vs synthesis?

Summary = each source in turn; synthesis = sources combined around a theme to show the pattern, tension, and gap.

How do I build one?

Sources down the side, themes across the top, fill the cells, then write a paragraph per column.

What columns?

Citation, a column per theme, and a method/critical-notes column (add sample/design/finding if useful).

Structure your review → Open the Lit Review Synthesizer →