Critical Reasoning
Critical Reasoning
Critical reasoning tests the ability to evaluate arguments — identifying assumptions, finding what strengthens or weakens an argument, and determining the best course of action.
Key Idea
Every argument has a premise (given facts) and a conclusion (what is claimed). The gap between them is the assumption. Strengthening fills the gap; weakening exploits it.
Core Rules
Assumption Identification
The assumption is the unstated premise that MUST be true for the conclusion to hold
When asked "Which of the following is an assumption?" — negate each option and check if the argument collapses.
Negation Test
Negate the option: if the argument breaks down, that option IS the assumption
Fastest way to confirm an assumption — used in UPSC CSAT and banking exams.
Strengthen/Weaken
Strengthening adds support to the conclusion; weakening introduces a counter-possibility that breaks the premise-conclusion link
When asked to strengthen or weaken a given argument.
Course of Action
A course of action is valid only if it is practically feasible AND directly addresses the problem stated
When asked which course of action follows from a given situation.
Inference vs. Assumption
An inference is what can be concluded from given data; an assumption is what must be presupposed. Do not confuse them.
When options mix inferences and assumptions to create traps.
Relevant Exams
Critical reasoning is heavily tested in UPSC CSAT (4-5 questions) and banking mains. The negation test alone can solve most assumption questions in under 60 seconds.