Logical thinking in one sentence
Logic is simply making sure each step of your reasoning holds up. Most reasoning errors aren't complicated — they're one missing step that felt obvious at the time.
The logical thinking checklist
- What exactly is the claim? Write it in one sentence.
- What facts support it? List only things you could show someone else.
- Does the conclusion actually follow? “Sales dropped after the price rise” doesn't prove the price rise caused it.
- What else could explain it? Name at least one alternative.
- What's the weakest link? Find the step you assumed — that's the one to check.
- What would change your mind? If nothing could, you're defending a position, not reasoning.
Common logic traps
Watch for: mistaking “happened together” for “caused”; “it worked last time” when the situation has changed; all-or-nothing choices when a smaller middle step exists; and sunk cost — carrying on because of what you've already spent rather than what comes next.
Frequently asked questions
How can I train my brain to think more logically?
Practise breaking everyday decisions into claim, evidence and conclusion, and always ask what else could explain the facts. Puzzles help a little, but practising on real decisions carries over better.
What is the difference between logical and critical thinking?
Logical thinking checks whether a conclusion follows from the facts. Critical thinking also asks whether the facts themselves are reliable.
Why do smart people make illogical decisions?
Usually pressure, emotion or overconfidence. A short, fixed checklist for big decisions protects you at the moments you're least likely to reason carefully.