Main Idea and Summary guide
Main Idea and Summary questions ask for the single claim the passage is built to support, or the option that best summarises the whole passage rather than one vivid part of it.
The method
- Ask what claim every paragraph or sentence is there to serve — that is the main idea.
- A correct summary covers the whole passage, not just its most memorable detail.
- Reject options that are true but too narrow, and options that are broader than the passage supports.
- A summary reports the passage; it does not add a new judgement or recommendation.
How to find the main idea without choosing a true-but-narrow option
A correct summary covers the passage's central claim and its overall scope. It does not need every example, but it must explain why those examples are there. Ask what one sentence the author would keep if the supporting detail had to be removed.
Check the opening and closing sentences, then label each paragraph's job: claim, evidence, contrast, consequence or recommendation. An option that describes only one job is usually too narrow; one that introduces a new judgement is too broad.
Final check before you answer
- State the passage's subject and what it says about that subject.
- Prefer coverage of the whole passage over a memorable detail.
- Reject summaries that add a purpose, opinion or consequence the author did not state.
Common mistakes
- Choosing a true-but-narrow detail as the main idea.
- Choosing a topic statement that is broader than the passage.
- First-sentence bias — assuming the opening line is the main point.
- Picking a summary that smuggles in an evaluation the passage never makes.
Worked examples
Three real questions from this category, moving from easy to hard, with the verified answer and the exact evidence that decides each one.
Example 1: easy
The car park is free for the first two hours. After that, each extra hour costs three pounds.
Which option best captures the passage as a whole?
Verified answer: E — Parking is free for the first two hours and then costs three pounds for each extra hour.
The evidence
The car park is free for the first two hours. After that, each extra hour costs three pounds.
The highlighted text decides the answer.
What to notice
Two facts: a free period and a later charge.
The rule
The best summary keeps both, adding or reversing nothing.
Why the others are wrong
- A — All parking in the area is free of charge.: Too broad: not all parking is free, and there is a charge.
- B — Parking is free all day on Sundays.: Added claim: no Sunday rule is stated.
- C — Parking costs three pounds from the moment you arrive.: Contradicted: the first two hours are free.
- D — The notice explains where to display your parking permit.: Unsupported focus: permits are not mentioned.
Example 2: medium
Version 4.2 replaces the old password login with a required one-time code sent by email. Saved reports from earlier versions will open in read-only mode until they are re-exported. Support for the version 2 plug-in interface ends with this release. The full list of fixed bugs appears in the appendix to these notes.
Which option is the best summary of the passage?
Verified answer: B — Version 4.2 switches sign-in to a required emailed one-time code, opens older saved reports as read-only until they are re-exported, and ends support for the version 2 plug-in interface.
The evidence
Version 4.2 replaces the old password login with a required one-time code sent by email. Saved reports from earlier versions will open in read-only mode until they are re-exported. Support for the version 2 plug-in interface ends with this release. The full list of fixed bugs appears in the appendix to these notes.
The highlighted text decides the answer.
What to notice
The release makes three changes: a required emailed one-time-code login, read-only older reports until re-exported, and the end of version 2 plug-in support; the fixed-bug list is only an appendix.
The rule
The best summary compresses every key change without adding a claim, omitting a necessary one, or reversing what the passage says.
Why the others are wrong
- A — The notes are mainly a catalogue of the bugs fixed in this release.: Distorted emphasis: the fixed-bug appendix is an incidental detail, not what the notes are mainly about.
- C — Version 4.2 replaces password login with an emailed one-time code and opens older saved reports in read-only mode until they are re-exported.: Partial summary: it states the new login and the read-only reports but omits the necessary end of version 2 plug-in support.
- D — Users can keep signing in with their existing password in version 4.2.: Contradicted: the password login is replaced by an emailed one-time code, the opposite of keeping the existing password.
- E — The login change was made after a recent breach exposed customer accounts.: Added claim: the notes give no reason for the login change and never mention a breach.
Example 3: hard
From next quarter, every production batch must pass an automated optical scan before it is released to packing. Because the scanner detects only surface defects, inspectors must also measure a sample from each batch for internal tolerances. If either check fails, the whole batch is quarantined, and it cannot ship until an engineer approves a documented rework plan. Although the added steps slow the line, the plant adopts them because earlier detection of faults is expected to reduce costly customer returns.
Which option is the best summary of the passage?
Verified answer: E — The plant adds a two-stage batch check, an automated surface scan plus manual sampling of internal tolerances, quarantines any failing batch until an engineer signs off a rework plan, and accepts a slower line because earlier fault detection should cut customer returns.
The evidence
From next quarter, every production batch must pass an automated optical scan before it is released to packing. Because the scanner detects only surface defects, inspectors must also measure a sample from each batch for internal tolerances. If either check fails, the whole batch is quarantined, and it cannot ship until an engineer approves a documented rework plan. Although the added steps slow the line, the plant adopts them because earlier detection of faults is expected to reduce costly customer returns.
The highlighted text decides the answer.
What to notice
Four linked facts describe one regime: a mandatory scan, an added manual sample because the scan sees only the surface, a quarantine-until-rework rule, and a slower line accepted to cut returns.
The rule
The best summary compresses every stated point without adding a claim, omitting a necessary constraint, or reversing the passage's causal or temporal order.
Why the others are wrong
- A — The passage is mainly about why the optical scanner cannot detect faults inside a product.: Distorted emphasis: the scanner's surface-only limitation is a supporting reason, not the passage's main point.
- B — The plant introduces a two-part inspection, an automated surface scan and manual sampling of internal tolerances, and accepts a slower line in order to reduce customer returns.: Partial summary: it states the two-stage check and the slower-line trade-off but omits the necessary quarantine-until-rework consequence.
- C — The company is overhauling its entire manufacturing process to guarantee that no defective product ever reaches a customer.: Too broad: it inflates a batch-inspection step into a whole-process overhaul and an absolute zero-defect guarantee the passage never makes.
- D — A batch that fails either check may still ship while the engineer prepares its rework plan.: Contradicted: a failing batch is quarantined and cannot ship until the engineer signs off, the opposite of this option.
Frequently asked questions
What's the difference between the main idea and a detail?
The main idea is the point the details exist to support. A detail can be accurate yet still be too small to be the passage's central claim.
Practise this now
See more worked examplesStart practising — free
Use this skill in SHL-style verbal practice
Editorial responsibility: Alexander Torstensson. See the verification and corrections process.