3. From Sources to Synthesis and Argument
3. From Sources to Synthesis and Argument
The decision
A source summary asks, “What did this paper say?” Synthesis asks, “What should I conclude after comparing the papers?”
Learning outcomes
You will be able to:
- build a compact evidence matrix;
- distinguish findings, interpretations, and limitations;
- explain disagreement instead of merely listing it;
- construct an argument using claim, evidence, warrant, and limit.
1. Build the smallest useful matrix
Use one row per study, not one row per quotation.
| Source | Question/design | Context/sample | Result | Limit | Job in my paper |
|---|---|---|---|---|---|
| review A | systematic review | 60 higher-education studies | benefits and challenges recur | studies heterogeneous; many qualitative | map field and gaps |
| meta-analysis B | quantitative synthesis | 24 writing studies | improvement versus no feedback | few direct comparisons; wide uncertainty | estimate average effect |
| class study C | observational | 114 undergraduates | feedback features relate to revision | self-selection; one setting | explain mechanism |
The job column changes reading into writing. Typical jobs are: define, establish pattern, provide counterevidence, explain mechanism, justify method, or set a boundary.
2. Separate three layers
For every source, write:
| Layer | Question | Example |
|---|---|---|
| observation | What was measured or recorded? | final drafts received higher rubric scores |
| author inference | What did the authors conclude? | peer feedback improved writing |
| your use | What can this project safely infer? | improvement is consistent with an effect, but assignment may confound it |
Do not copy an author's causal verb automatically. Recheck the design.
3. Code patterns, not authors
After five to ten rows, mark each source by:
- direction: positive, null, negative, mixed;
- mechanism: noticing, explanation, motivation, social accountability;
- boundary: novice/expert, discipline, online/in-person, task type;
- quality: strong, usable with caution, weak for this claim.
Then ask:
- What pattern survives across studies?
- Where does it change?
- Is the disagreement substantive or produced by different measures/designs?
- Which explanation fits the full pattern with the fewest exceptions?
4. Write a synthesis sentence
Source-by-source version
Study A found benefits. Study B also found benefits. Study C found mixed results.
Synthesised version
Peer feedback is generally associated with better academic writing, but the size and reliability of the improvement vary with feedback structure, comparison group, and outcome measure; the literature therefore supports a conditional rather than universal claim.
The second version states the pattern, variation, and implication. Citations would then show which sources support each part.
5. Build the argument: C–E–W–L
| Part | Running example |
|---|---|
| Claim | Structured prompts may improve the usefulness of peer comments. |
| Evidence | Studies report that feedback characteristics are associated with revision behaviour. |
| Warrant | Prompts direct reviewers toward actionable criteria, increasing the chance that comments can be used. |
| Limit | The association may partly reflect writer motivation or prior skill. |
Without the warrant, the reader sees two facts but not the reasoning between them. Without the limit, the paragraph claims more than the evidence earns.
6. Explain conflicting evidence
Use the pattern:
Agreement → conflict → diagnostic comparison → best explanation → remaining uncertainty
Example:
Most studies report improvement after peer feedback, whereas some find little change. The difference is not necessarily a direct contradiction: positive studies often compare feedback with no feedback, while null studies compare it with teacher feedback or use different writing outcomes. The evidence therefore suggests that peer feedback can add value relative to no feedback, but does not establish that it is always superior to expert feedback.
This is synthesis because the comparison changes the conclusion.
7. Turn the matrix into an outline
Headings should perform jobs.
| Weak heading | Analytical heading |
|---|---|
| Peer feedback | What structured feedback changes |
| Benefits | Evidence for improvement is positive but heterogeneous |
| Challenges | Reviewer skill and uptake constrain the mechanism |
| First-year students | Novice writers may need stronger scaffolding |
For each section, write one sentence:
This section must establish ______ so that the next section can ask ______.
If two sections have the same job, merge them. If a heading cannot finish the sentence, it may be background rather than argument.
8. Draft one paragraph from the matrix
1. Claim: answer one section-level question.
2. Evidence: compare at least two relevant sources.
3. Warrant: explain why the comparison supports the claim.
4. Limit: identify the most important boundary.
5. Link: state what question follows.
One paragraph need not contain five separate sentences, but it must perform all five functions across the local passage.
Practice: the three-source synthesis
Choose three sources that appear to disagree.
- Enter one matrix row for each.
- Circle differences in sample, intervention, measure, and comparison.
- Write one pattern sentence and one boundary sentence.
- Draft a C–E–W–L paragraph of no more than 140 words.
- Remove every source name that is not needed for the reasoning.
Quality check
- the matrix records design and limits, not just findings;
- sections are organised by questions or claims, not authors;
- disagreement is diagnosed rather than announced;
- each important claim has a visible warrant;
- confidence decreases when evidence quality or transferability decreases.
Next: use the synthesis to write a literature review and defensible gap.