---
name: phg-argument-synthesis
description: Use when turning a mapped literature into one cumulative argument for a Progress in Human Geography (PiHG) review essay — synthesizing many sources into a claim the field could not see from any one of them. Builds the synthetic spine; it does not gather sources (see phg-literature-positioning) or make the critical turn (see phg-critical-intervention).
---

# Argument Synthesis (phg-argument-synthesis)

The single most important craft in a PiHG essay: **synthesis**. A review is not an ordered summary of what
others found; it is an **argument the sources add up to but none of them made alone**. Reviewers and
editors reject "annotated bibliography" pieces on sight. This skill turns a mapped literature
(`phg-literature-positioning`) into a **cumulative claim** organized by your concept
(`phg-theory-building`).

## When to trigger

- You have the corpus and the concept, and must now build the spine
- The draft reads as "A found X, B found Y, C found Z" — a list, not an argument
- A reviewer said "this is descriptive," "where is the argument?," or "just a summary"
- You cannot state the essay's thesis in one sentence

## Summary vs. synthesis (the core distinction)

| Summary (reject) | Synthesis (PiHG) |
|------------------|------------------|
| Organized by **source** (paper by paper) | Organized by **your concept / claim** |
| "X studied A; Y studied B" | "Across X and Y, the field has assumed Z — which fails because…" |
| Coverage is the goal | An **argument** is the goal; coverage serves it |
| Reader learns what exists | Reader learns **how to think** about the field |

If a paragraph's topic sentence names an author rather than an idea, you are summarizing. Rewrite so
**ideas are the subjects** and sources are the evidence.

## Build the cumulative spine

1. **State the thesis in one sentence.** The whole essay is the defense of this claim. If you cannot, go
   back to `phg-critical-intervention`.
2. **Decompose the thesis into 3–5 sub-claims.** These become the sections — organized by argument, **not**
   by the literature's own buckets.
3. **Under each sub-claim, marshal the evidence** from across the corpus: which works support it, which
   complicate it, and how they combine into the point.
4. **Make the sources talk to each other.** Put works that never cite each other into the same paragraph
   when your concept shows they are addressing the same relation.
5. **Handle disconfirming work honestly** — a synthesis that ignores contrary evidence is advocacy, not a
   review. Fold it in and show why the thesis survives (or scope it).

## The "one sentence" and "adds up" tests

- **One-sentence test**: can you say what the essay *argues* (not covers) in a sentence? If not, there is
  no spine yet.
- **Adds-up test**: does the conclusion state something **no single cited work says**? A review whose
  conclusion is already in one of its sources has synthesized nothing.

## Reconcile, periodize, or adjudicate

Three reliable synthetic structures (pick the one your literature needs):

- **Reconcile** — show two camps that talk past each other are compatible under your concept.
- **Periodize** — narrate how the field's thinking moved through phases, to intervene in the next.
- **Adjudicate** — weigh a live disagreement and argue which side the evidence, read together, favors.

## Checklist

- [ ] Thesis stated in one sentence; essay is its defense
- [ ] Sections organized by sub-claims, not by the literature's buckets or by source
- [ ] Paragraph topic sentences name ideas, not authors
- [ ] Works that never cite each other are brought into contact where the concept links them
- [ ] Disconfirming evidence engaged, not ignored
- [ ] Conclusion states something no single source states (adds-up test)

## Anti-patterns

- Annotated-bibliography structure (one paragraph per paper)
- Topic sentences that start with an author's name
- "Coverage" mistaken for contribution — comprehensive but argument-free
- Cherry-picking supportive work and dropping the inconvenient
- A conclusion that merely restates the most-cited paper's point

## Output format

```
【Thesis】the one-sentence claim the essay defends
【Sub-claims】the 3–5 argument-sections
【Synthetic structure】reconcile / periodize / adjudicate
【Sources in contact】which non-citing works your concept joins
【Adds-up?】does the conclusion exceed any single source? [Y/N]
【Next】phg-critical-intervention
```

## Supplementary resources

- [`../../resources/worked-examples/01-introduction.md`](../../resources/worked-examples/01-introduction.md) — before→after: annotated list vs. cumulative argument
- [`../../resources/external_tools.md`](../../resources/external_tools.md) — CAQDAS and synthesis methods (thematic, meta-narrative, critical interpretive)