Assumption Questions — Fundamental Concepts

Fundamental Concepts

Necessary-assumption workflow

1
Write the conclusion in a short phrase.
2
Write the stated reason separately.
3
Identify the missing relation between them.
4
Test each candidate by a careful denial.
5
Choose the required link, not an unnecessary guarantee.

Negation reference

All A are B → at least one A is not B.
Some A are B → no A is B.
No A is B → at least one A is B.
Always successful → at least one failure.
If P then Q → a case with P and not Q defeats the condition.

The test is whether denial undermines the argument's offered support. It is not a demand to prove that the conclusion becomes impossible under every unrelated explanation.

Frequent bridges

Access: beneficiaries can use the proposed replacement. Representativeness: the evidence covers the population in the conclusion. Comparability: measured groups are comparable on the factor at issue. Feasibility: the proposed mechanism can operate under the stated conditions.

Avoid overreach

Necessary is not sufficient. A condition may be required while several other conditions are also needed. “Patients have an effective booking route” does not require “all patients own the latest phone”. Likewise, “some students can use the added hours” does not require a claim that every student prefers the library. Reject an option whose denial leaves the argument's specific rationale intact.