The Law of Non-Contradiction
What is The Law of Non-Contradiction?
A claim and its negation cannot both hold at the same time, about the same thing, in the same sense, under the same conditions. A proposal cannot claim “zero risk” and also concede “there are major risks we cannot control”. A manager cannot, under identical conditions, require staff to decide independently and also require every item to come to him for approval.
The Law of Non-Contradiction: common mistakes and how to handle them
But many “contradictions” are only apparent — different times (last year’s budget vs this year’s investment), different objects (admin spending vs strategic investment), different standards. The method is not for catching someone out; it is for finding the condition that was left unsaid. Four steps: (1) record only observable facts, without the emotion — “signing has been postponed three times”, not “the client is stalling”; (2) check whether the two statements really share one object, one time, one standard; (3) look for the condition under which both could be true — a client who likes the proposal but won’t sign may be short of budget, of internal approval, or of a risk plan; (4) verify with a neutral question — “is it mainly the budget or the process holding this up?” — rather than asking whether they are lying. “My boss says hands-off but approves every line item” and “the parent says they trust the child but keeps intervening” both come apart the same way.
What the The Law of Non-Contradiction questions test
spotting a genuine contradiction in a passage; telling one apart from an apparent contradiction that dissolves once the conditions differ; naming the missing condition that would make a “we need both X and Y” demand consistent; choosing the right next step after finding one — record the facts, find the condition, verify neutrally — rather than accuse.