Main Idea and Gist Comprehension
What this domain tests
Main Idea and Gist Comprehension asks you to state what a passage is chiefly about, or to summarise it in one sentence. The SLE rewards the answer that covers the whole passage, not the answer that is most interesting, most detailed, or most memorably worded. Every other domain depends on this one: if you misread the gist, detail questions become guesswork.
Core rules
- Scope match. The correct main idea covers everything the passage actually discusses, and nothing it does not. Test each candidate by asking: does any paragraph fall outside this statement? Does the statement claim something the passage never mentions?
- Topic vs. main idea. The topic is a phrase ("urban beekeeping"); the main idea is a claim about the topic ("urban beekeeping is growing because of declining wild pollinator populations"). Main-idea options that are only topics are wrong.
- Function of the opening and closing. Introductions often announce the topic; conclusions often state the point. The main idea frequently sits in the first or last two sentences, but a passage that opens with an anecdote usually delays its thesis until the anecdote is explained.
- Summary vs. gist. A summary condenses all major points; a gist captures the single controlling claim. Read the question stem to see which is wanted.
Worked example
A four-paragraph passage describes a city that replaced half its street trees with drought-tolerant species, explains the water savings, notes residents' complaints about lost shade, and ends by saying the programme will continue with a mixed planting plan. Which is the main idea?
- (A) Drought-tolerant trees save water. - True but covers one paragraph.
- (B) Residents objected to a tree-replacement programme. - True but partial.
- (C) A city's tree-replacement programme produced trade-offs that shaped its revised plan. - Covers cause, objection, and outcome.
(C) is correct because it accounts for every paragraph. (A) and (B) are detail-level statements.
Traps that cost marks
- Choosing a true statement that is too narrow (a supporting detail).
- Choosing an overbroad statement that extends beyond the passage ("all cities should plant drought-tolerant trees").
- Confusing the author's attitude with the main idea.
- Picking an option whose wording echoes the passage but reverses its logic.
Always eliminate on scope before weighing plausibility.