Assumptions
An assumption is a hidden prerequisite or unstated piece of evidence that an author implicitly relies on to connect their starting premise to their final conclusion.
Fundamental Principles
Implicit Assumption
An unwritten factual bridge that must be true for an argument's conclusion to hold together logically.
Essential Formulation Tips
- An assumption is always unstated. If an idea is explicitly written out in the sentence, it is a premise, not an assumption.
- Valid assumptions stay focused on the scope of the argument. Avoid choices that introduce extreme, unnecessary terms like 'every single person' or 'completely impossible'.
Shortcut Execution Techniques
- The Negation Test: If you flip an option to its opposite meaning (negate it) and that completely breaks the main argument, then that option is a necessary assumption.
Contextual Inquiries (FAQs)
Q: What happens if an argument can still function perfectly after an assumption is proven false?
A: Then that option was simply a helpful bonus or an irrelevant detail, not a necessary assumption.
Example Breakdown: Applying the Negation Test
Classic demonstration of assumption validation via negation.Apply the Negation Test: Assume the opposite statement is true: 'Automating scheduling tasks does *not* help prevent project delivery delays.'
Evaluate the argument with this flipped statement: If automation has no effect on delays, then buying the software will fail to fix those delays.
Because the argument breaks completely when this statement is flipped, the statement is a required foundation.
Conclusion: The assumption is implicitly valid.
Hidden Foundation Analysis
Practice isolating structural gaps and identifying unstated premises using the negation test.
Q1. Argument: 'The city should build more bike lanes to lower commuter traffic accidents.' Which option is a necessary assumption?