How to Map an Article’s Argument: A Worked Claim-and-Evidence Example
Separate a claim from its evidence and assumptions with a fictional library example, then write a summary that preserves the limits of the argument.
Read this short fictional argument
“During a four-week trial, our library recorded more evening visitors. We should therefore keep the later closing time throughout the year.” These sentences are invented for this exercise. The purpose is to practice separating observations from the decision being proposed.
Map each part before judging it
| Part | What the example contains |
|---|---|
| Observation | Evening visitor counts increased during the trial. |
| Proposed decision | Keep the later closing time all year. |
| Assumption to examine | The trial is informative about the rest of the year. |
| Missing comparison | Costs and other causes of the change are not stated. |
| Possible narrower conclusion | The trial gives a reason to investigate extended hours further. |
The observation and decision are not the same sentence. Someone can accept the attendance count while asking whether the proposed year-round decision follows. A clear map lets you locate that disagreement without dismissing every part of the argument.
Next, list what additional information would change your judgment: the earlier baseline, whether events changed during the trial, staffing costs and how visitors used the extra hours. This is a reading exercise, not a claim that those factors had any particular effect.
Write a faithful summary
A cautious summary is: “The author proposes retaining later hours after a four-week increase in evening visits. The passage does not provide costs or evidence about other seasons.” It preserves the proposal and its support without turning the trial into proof of year-round success.
Now compare your summary with the original. Check each noun and time period. Did “evening visitors” become “all visitors”? Did “four weeks” become “a year”? Did a proposal become a demonstrated outcome? These small changes can alter the argument.
Apply the worksheet to your next article
- Write the main conclusion in one sentence.
- List the evidence the author actually supplies.
- Mark the assumptions linking the two.
- Write what the evidence would not establish.
- Keep your critique separate from your neutral summary.
Use the dense-article reading worksheet for a broader reading pass, and the source-checking guide when the article depends on a citation you have not examined.
Published October 24, 2026 · BlogJD Editorial Desk · Editorial policy