SAT® · Reading and Writing: Craft and Structure
One Text Extending Rather Than Contradicting the Other
When two texts are paired, the second often builds on the first rather than fighting it: it explains a mechanism, names where the claim holds, or pushes the idea further. Your job is to see which.
Paired passages train you to read relationships, not just content. The easy, wrong move is to assume two texts about the same subject must disagree. Often the second text does something quieter: it supplies the why behind the first text's what. If Text 1 reports that crows across a valley make hooks of the same design, and Text 2 shows young crows spend months watching adults before trying it themselves, Text 2 is not challenging the finding. It is explaining the mechanism, the learning process, that produces the pattern Text 1 only described.
Two moves get confused constantly: adding a condition and limiting a claim. Both narrow the first text's scope, so they look identical at a glance. The difference is direction. Adding a condition says the claim holds here, and here is new information, widening your picture without taking anything away. Limiting a claim says the finding breaks down outside a certain zone, which is closer to a correction. A text that says mulch saves irrigation water on free-draining soil but backfires on clay is doing both at once: it extends the original claim's range of truth and marks its edge.
Extension has a breaking point. A text can stretch an author's own explanation so far past its original evidence that the author would no longer stand behind it. If Lopez credits her reading programme's gains to daily discussion, and a follow-up keeps the discussion but removes the books entirely, that follow-up is not a neutral add-on. It walks her reasoning to a conclusion, that the books were pointless, that she never tested and likely never intended. Spotting that overreach is the same skill in a sharper form.
Key terms
- Extension
- A second text building on a first text's claim by explaining, bounding, or applying it further, without rejecting it.
- Mechanism
- An explanation of how or why an observed pattern happens, rather than just reporting that it happens.
- Adding a condition
- Specifying a situation where a claim holds, which widens understanding without weakening the original finding.
- Limiting a claim
- Showing where a finding breaks down or reverses, which narrows how far the original claim can be trusted.
- Overreach
- Extending an author's reasoning past the point the original evidence supports, to a conclusion the author would reject.
Watch it explained
- How it worksHow does a text supplying a mechanism for another text's observation count as extending it?
- How it worksHow do you tell 'adds a condition' apart from 'limits the claim' when both narrow a theory?
- Worked exampleTrace the link where one text reports that crows use tools and another explains how young crows learn it.
- Going furtherWhat happens when a text extends a claim so far that the original author would no longer accept it?
Check yourself
End of topic.