Main Idea And Detail Questions

Two Common Question Types

The two most common Written Comprehension tasks are main-idea questions and detail questions. They test opposite ends of the reading skill. A main-idea question zooms out; a detail question zooms in. Recognizing which one you are facing is the first move, because it tells you how far to read for support.

A main idea is the passage's overall message — broader than any single fact, but narrower than a one-word topic label. If a passage describes the steps for verifying a visitor's identification at a corrections facility, the main idea is the verification process, not the name of one document or one visitor. Main-idea stems use signals like "mainly about," "best title," "primarily concerned with," or "the passage as a whole."

A detail question is targeted. It asks what happened first, where something was placed, who completed a task, or which condition applied. Detail stems use signals like "according to the passage," "the passage states that," or "which of the following is true." The correct detail answer must match the passage word-for-word in meaning — a choice can be wrong because it changes a single word, reverses an order, swaps an actor, or adds a condition that was never stated.

Sorting Stems By Clue

Scope Is The Deciding Factor

Most main-idea errors are scope errors. A choice that names only one small example is too narrow; a choice that makes a claim larger than the passage is too broad. Read the whole choice, not just a familiar phrase. The right main-idea answer covers everything the passage discusses and nothing it does not.

Most detail errors are distortion errors. The distractor borrows real words from the passage but bends a relationship. Watch for four classic distortions: a swapped actor (the manager did it, not the officer), a reversed order (after became before), an added condition ("only if" inserted where the passage had none), and an overstatement ("always" where the passage said "in this case").

Worked Example: Main Idea vs. Detail

Passage: "A corrections officer conducts a formal count three times per shift to confirm that every inmate is accounted for. If a count does not match the roster, the officer immediately notifies the shift supervisor and recounts the affected housing unit. Accurate counts are the foundation of facility security."

Question 1 (main idea): The passage is mainly about — (A) how to notify a supervisor; (B) the purpose and process of inmate counts; (C) the number three; (D) inmate housing assignments.

Question 2 (detail): According to the passage, what does the officer do first when a count does not match the roster? — (A) Files a written report; (B) Recounts the entire facility; (C) Notifies the shift supervisor; (D) Ends the shift early.

For Question 1, the passage's whole message is that counts confirm accountability and underpin security — choice (B) covers the full passage. Choice (A) is one step (too narrow), (C) is a stray number, and (D) is never discussed. For Question 2, the passage states the officer notifies the supervisor, then recounts the affected housing unit — so the first action is choice (C). Choice (B) distorts "affected housing unit" into "entire facility," (A) adds an unstated report, and (D) is invented. Same passage, two different reading depths.

The 'True But Not The Answer' Trap

The most seductive main-idea distractor is a statement that is true according to the passage but is only a detail. On the inmate-count passage, "counts happen three times per shift" is perfectly true — yet it is a supporting fact, not the central point, so it loses to the broader purpose-and-process answer. * A true detail masquerading as a main idea is wrong precisely because the question asked for scope, not accuracy. The reverse trap appears on detail questions, where a broad, passage-wide summary is offered as the answer to a narrow 'according to the passage' stem — too big to be the specific fact requested.

A Repeatable Routine

Because Section III runs 40 items in 60 minutes, you need a fixed routine. For a main-idea item, pause after reading and say the passage in one phrase before viewing choices; then pick the option closest to that phrase. For a detail item, find the relevant line first, then test choices against it. When two choices are close, prefer the one that hugs the passage's exact scope and wording. In review, label every miss — true-but-narrow detail, distorted relationship, or outside assumption — so the pattern is visible the next time.