Command of Evidence: what the SAT is testing
Command of Evidence belongs to Information and Ideas in SAT Reading & Writing. This page is a theory checkpoint: read it, use the example, then jump into practice while the pattern is fresh.
Information questions ask what the text says, implies, or proves. The correct answer is anchored in evidence; it should feel slightly boring because it stays inside the text.
On test day, this skill should feel like a sequence of decisions rather than a vague topic. First identify the task, then choose the representation or rule, then check the answer against the exact wording of the question.
Fast rule: if you cannot explain what the question is asking in one sentence, do not start solving yet.
Key ideas to remember
- For central idea, summarize the whole passage, not one detail.
- For detail questions, locate the exact sentence.
- For inferences, choose what must be true, not what could be true.
- For evidence, match the support to the claim.
- For quantitative evidence, connect numbers to the text claim.
Worked SAT-style example
Example. A passage says a new material is lighter than steel but not yet cheap to produce. A valid inference is that cost may limit immediate use. An answer saying the material will replace steel everywhere goes beyond the evidence.
SAT move. Inference means controlled extension, not imagination.
Why it works. The example is short because the setup is doing most of the work. SAT questions often become difficult only when the setup is hidden inside extra wording.
Step-by-step method
- Read the prompt first. Know whether the question asks for meaning, evidence, grammar, structure, or purpose.
- Use local context. Most answers are decided by the sentence or two around the blank or claim.
- Predict the job. Say what the answer must do before reading the choices.
- Eliminate precisely. Name why each wrong answer fails: scope, tone, logic, grammar, or evidence.
- Read it back. Insert the answer and make sure the whole sentence or passage still works.
SAT tips
- Underline the proof sentence.
- Beware answers that are true but unsupported.
- Use graph titles and labels before comparing values.
- For central idea, reject answers that mention only a side detail.
- If an answer adds a new extreme word, test it carefully.
One useful habit is to pause for two seconds before looking at answer choices. That pause lets your own setup or prediction lead, instead of letting four tempting options pull you around.
Common traps
- Overstating the author's claim.
- Choosing a detail as the main idea.
- Ignoring the sentence before or after the cited line.
- Reading a chart value without checking units.
- Picking an answer because it sounds familiar.
How to review this skill
After a practice set, sort every missed question into a cause. Was the setup wrong? Did you miss a clue? Did you know the rule but rush? Did you choose an answer that was true but not responsive to the prompt?
Then redo the problem without looking at the explanation. If you can solve it cleanly, change one detail and solve the new version. That proves you learned the pattern, not just the answer.
- One-minute drill: identify the question type and write the first setup step.
- Five-question drill: solve slowly and name the rule used in each question.
- Timed drill: repeat the same skill until the setup becomes automatic.
Second SAT-style example
Second example. A passage says a city planted trees and summer street temperatures fell in the shaded areas. A supported conclusion is that shade may reduce local heat. A claim that trees solve all urban heat problems would be too broad.
What to notice. Correct evidence answers stay close to the scope of the text.
How answer choices try to fool you
- Too broad: the answer is bigger than what the text proves.
- Too narrow: the answer focuses on one detail instead of the whole job.
- True but irrelevant: the statement may be accurate but not answer the prompt.
- Wrong relationship: the choice reverses contrast, cause, sequence, or emphasis.
- Overly formal: polished wording can still be less precise or less grammatical.
Difficulty ladder
- Foundation: identify the direct grammar rule, meaning, or evidence line.
- Medium: compare two plausible choices and eliminate by scope or logic.
- Advanced: handle subtle tone, cross-text relationships, dense notes, or punctuation around complex clauses.
A strong reader does not rush the hard version; they become precise about the clue that controls the answer.
Extra SAT tips
- Read one sentence before and after the underlined portion or blank.
- For grammar, the shortest correct answer is often best, but only after it passes the rule.
- For evidence, make the answer earn every word from the text.
- For transitions, write the relationship in one word: contrast, cause, example, sequence, or emphasis.
- For review, explain why the wrong answer was tempting. That is the habit you need to break.
