Strengthen-weaken arguments

Story hook

"Statement: All major cities in India should ban diesel vehicles immediately. Which of the following arguments is strong? (I) Yes — diesel emissions cause asthma in children. (II) No — diesel taxis are the livelihood of millions of drivers."

The naive candidate picks (I) — because "diesel is bad". But that's not how strong/weak arguments work.

A strong argument must do three things at once:

1. Be directly relevant to the statement.
2. Be supported by an objective, verifiable basis (data, precedent, causal mechanism).
3. Address practicality — what happens if the policy is or isn't followed.

Argument (I) gives a verified causal mechanism (emissions → asthma) → strong. Argument (II) raises a real concern but doesn't address whether the ban is justifiable — just inconvenient. Inconvenience alone is not a strong counter-argument; the burden of proof shifts to whether the inconvenience outweighs the harm. So (II) is weak as phrased.

Both is the more common right answer in real CSAT — because real policy debates always have strong arguments on both sides. The CSAT version of "critical reasoning" is the aspirant's first taste of what GS-IV ethics will demand.

This unit teaches: the 4-rule test for strong vs weak arguments, the cause-effect classifier, the assumption test, and the "course of action" framework.

Why this matters for UPSC

For CSAT (Paper II, qualifying 33%):

• 2-5 questions per paper on critical reasoning. Trending UP since 2014 — UPSC is shifting toward inferential, not factual, questions.
• These questions most closely mirror real Mains/Interview thinking — argument quality, assumption-identification, cause-effect logic.
• Highest analytical bar in CSAT. Other sections test speed; this section tests rigor.

For Mains GS-IV (Ethics) and Mains GS-II (Polity) — the same skill becomes answer-writing strategy. A candidate who can identify a weak argument in CSAT will produce stronger Mains answers.

For Interview, boards explicitly probe strong/weak arguments: "What's the strongest argument against your position?" If you can't construct one, the board concludes you haven't thought through the issue.