Main ideas, supporting evidence and passage structure

01 / UNDERSTAND & APPLY

Original passage: a catalogue and its users

When the city of Orven digitized its building-permit archive, planners expected historical research to become faster. Search logs did show that researchers found scanned permits quickly. Yet historians studying the development of working-class districts reported that the new catalogue sometimes made their work harder. Most permits had been indexed by the modern street address. Several streets had been renamed, while buildings later combined into a single property had once carried separate addresses. A precise search could therefore retrieve a clean-looking but incomplete record. The archive team responded by adding a map of historical addresses and allowing researchers to search by earlier parcel boundaries. In a trial involving the same twelve trained researchers and two sets of comparable tasks, the proportion of tasks yielding all relevant permits increased from 50 percent with the original catalogue to 75 percent with the revised one. The team emphasized that the trial measured completeness, not the time needed to finish each task. A curator nevertheless argued that the added map merely complicated an otherwise successful system because most casual visitors wanted only one recent permit. The curator's observation identifies a real difference between users, but it does not settle how the archive should serve historical inquiry. A catalogue can work well for retrieving a known document while performing poorly as a guide to documents whose existence a researcher does not yet know. The revision therefore illustrates a broader point: digitization improves access only in relation to the questions that an indexing system enables users to ask. The trial supports keeping the historical map available; it does not show that every visitor should be required to use it.

02 / UNDERSTAND & APPLY

Main idea is a claim about a topic

A topic names the subject: an archive catalogue. A main idea states what the author wants you to understand about that subject: useful digital access depends on the research questions the index supports. The best summary covers the important turns without promoting one example into the entire thesis.

First compress each paragraph into a job, then ask which claim makes the jobs fit together. A thesis may appear at the end, at the beginning or indirectly through the pattern of discussion. Do not choose the longest or most general answer merely because it sounds comprehensive.

03 / UNDERSTAND & APPLY

Purpose and paragraph roles

Purpose concerns what the writer is doing: explaining a distinction, challenging an interpretation, reconciling findings or defending a qualified recommendation. It differs from the thesis, which is the content of the claim.

A paragraph role is relational. “Discusses a map” names content; “presents a revision and the evidence used to evaluate it” states a role. Write a map that is useful for returning to evidence without memorizing every detail.

04 / UNDERSTAND & APPLY

Supporting details answer narrower questions

A detail question asks what the text says, not whether its methods are ideal. Locate the relevant sentence and retain its subject, comparison and qualification. A true statement about the world is not a substitute for textual evidence.

Be especially alert when an option changes who did something, what was measured or which population a result covers. An answer can reuse nearly all the passage’s words and still reverse its meaning.

05 / UNDERSTAND & APPLY

Contrast, concession and logical relationships

Contrast introduces a difference; concession accepts a limited point without accepting the opposing conclusion. “Yet” in paragraph one separates rapid retrieval from comprehensive discovery. “Nevertheless” introduces a competing evaluation rather than a finding that refutes the trial.

The last paragraph concedes that visitors have different needs. It rejects the inference that the needs of casual visitors settle the needs of historians. An author can accept a premise while challenging its relevance or claimed consequence.

06 / UNDERSTAND & APPLY

Separate voices and keep numerical claims attached

Track speaker labels: planners expected; historians reported; the team emphasized; the curator argued; the author concluded. Reporting a claim is not endorsing it. An option attributing the curator’s dismissal to the author reverses the passage.

For quantitative details retain numerator, denominator, baseline and outcome. Moving from 50% to 75% is a 25-percentage-point increase and a 50% relative increase in the measured proportion. Neither means that researchers found 25% more documents overall. Counts of tasks were not supplied, so do not invent them.

07 / UNDERSTAND & APPLY

Reject summaries that alter the passage

Common distractors are too narrow, too broad, reversed, unsupported or attached to the wrong speaker. A narrow option may accurately describe the map but omit the general distinction between known-item retrieval and discovery.

A practical check is to explain why each paragraph belongs under your proposed main idea. If an answer cannot account for the curator or the final qualification, it is probably incomplete. Use this as a diagnostic rather than a rule that every minor detail must appear in the summary.

08 / UNDERSTAND & APPLY

Practice: use the full passage

For questions 1–6 use the Orven passage. Select one option where choices are given; short responses should cite the decisive text.

09 / UNDERSTAND & APPLY

Practice: a second structure

A seed bank first classified donations by donor name. This made acknowledgments easy but made it difficult to locate varieties adapted to dry soils. A new soil-tolerance index improved retrieval for restoration projects, although staff retained donor records for correspondence. The director concluded that a useful classification depends on the task it is intended to support.