How is Key Ideas and Details tested on the ACT?

Questions ask for main ideas, explicitly stated details, sequence and cause-effect relationships, and close inferences. Every correct answer is supported by specific lines, even when it's paraphrased.

What's the most common mistake on Key Ideas and Details?

Choosing an answer that's true of one detail but not the passage's main idea, or relying on memory instead of returning to the text for specifics. Confusing the order of events is common on narrative passages.

What's the fastest way to improve at Key Ideas and Details?

Note each paragraph's job with a quick mental summary, return to the passage for line support before committing, and practice with a timer so efficient, evidence-based reading becomes habit.

ACT Reading · Key Ideas and Details

Key Ideas and Details

Key Ideas and Details is the largest ACT Reading category, covering main ideas, summaries, and relationships like sequence and cause and effect. Because the ACT Reading test is tightly timed, the skill is reading efficiently while still grounding every answer in the text. The correct answer is always supported by specific lines, even when it's paraphrased.

Quick answer

Key Ideas and Details is the largest ACT Reading category, covering main ideas, summaries, and relationships like sequence and cause and effect, all grounded in specific lines under tight timing.

What it tests

Identifying the main idea of a passage or paragraph
Locating explicitly stated details and understanding them in context
Following sequence, cause and effect, and comparisons
Summarizing key points accurately
Making close inferences directly supported by the text

Common mistakes

Choosing an answer that's true of one detail but not the passage's main idea
Relying on memory instead of returning to the text for specifics
Confusing the order of events in a narrative or process
Picking a choice with the right topic but a distorted relationship

How to improve

Note each paragraph's job with a quick mental summary as you read
Return to the passage and find line support before committing to an answer
Track sequence and cause-effect words to keep relationships straight
For main-idea questions, prefer the choice that covers the whole passage
Practice with a timer so efficient, evidence-based reading becomes habitual

Drill Key Ideas and Details with adaptive practice

Claros builds an adaptive practice set around your weakest skills and keeps the difficulty honest, so every key ideas and details question is calibrated to where you actually are.

Practice Key Ideas and Details with Claros Free readiness check

Frequently asked questions

How is Key Ideas and Details tested on the ACT?: Questions ask for main ideas, explicitly stated details, sequence and cause-effect relationships, and close inferences. Every correct answer is supported by specific lines, even when it's paraphrased.
What's the most common mistake on Key Ideas and Details?: Choosing an answer that's true of one detail but not the passage's main idea, or relying on memory instead of returning to the text for specifics. Confusing the order of events is common on narrative passages.
What's the fastest way to improve at Key Ideas and Details?: Note each paragraph's job with a quick mental summary, return to the passage for line support before committing, and practice with a timer so efficient, evidence-based reading becomes habit.