Author Assumptions — SAT Reading & Writing Explained
An assumption is an unstated premise the author relies on to make their argument work. Identifying assumptions reveals the hidden foundation of an argument.
The Core Idea
Every argument has unstated premises — things the author takes for granted. If you negate an assumption, the argument collapses. Identifying these is key to evaluating argument strength and answering 'what must be true' questions.
Key Vocabulary
An unstated premise required for an argument to work
A stated or unstated piece of evidence supporting a conclusion
The claim an argument is trying to establish
The missing step between evidence and conclusion that an assumption fills
How To Find Assumptions
1. Identify the conclusion (what is the author trying to prove?)
2. Identify the stated evidence (what reasons are given?)
3. Ask: What must be true for this evidence to support this conclusion?
4. The answer to that question is the assumption
Negation Test
To test if an answer is truly an assumption, negate it. If negating it destroys the argument, it's a core assumption.
Common Errors to Avoid
Confusing a stated claim with an assumption (assumptions are never stated)
Choosing an assumption that strengthens the argument rather than the underlying one
Selecting the conclusion itself rather than the unstated premise
How This Connects to Other Topics
Builds from Inference and leads into Rhetorical Techniques and Evidence-based Questions
Practice: Author Assumptions
5 SAT-style questions. Select your answer and get an instant explanation.
Children who spend more time outdoors have been shown to perform better in school. Therefore, schools should reduce the amount of homework assigned and instead encourage students to play outside in the afternoons.
Which assumption is the author making in this argument?
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