Master practical techniques for clear thinking: the pre-mortem, devil's advocate, the outside view (base rates), and the five-question checklist.
From knowledge to habit
You can't “switch off” biases, but you can put up safeguards
The bad news: knowing about biases doesn't switch them off. You've already seen it — even knowing about the Müller-Lyer illusion, you still see the lines as different. Willpower is almost powerless here.
The good news: what helps is not pep talks but procedures — simple external techniques that build a check into the moment of decision. Pilots, surgeons, and engineers use them: not “be more careful” but “go through the checklist”.
A few proven techniques:
— A “pre-mortem”. Before deciding, imagine that a year has passed and everything has failed. Ask: “Why did it fail?” The imagined failure makes you see in advance the risks that optimism hides.
— Devil's advocate. Deliberately look for arguments AGAINST your decision (or ask someone else to). A direct antidote to confirmation bias.
— The outside view (base rate). Not “our case is special” but “how do projects like this usually turn out for others?” Other people's statistics are a sobering check on optimism.
— A pause and sleep. For important decisions — put it off and sleep on it. This gives System 2 a chance to catch up with System 1.
The point is simple: don't trust the first confident answer; run it through questions prepared in advance.
Lesson notes
You can't “switch off” biases, but you can put up safeguards
The bad news: knowing about biases doesn't switch them off. You've already seen it — even knowing about the Müller-Lyer illusion, you still see the lines as different. Willpower is almost powerless here.
The good news: what helps is not pep talks but procedures — simple external techniques that build a check into the moment of decision. Pilots, surgeons, and engineers use them: not “be more careful” but “go through the checklist”.
A few proven techniques:
— A “pre-mortem”. Before deciding, imagine that a year has passed and everything has failed. Ask: “Why did it fail?” The imagined failure makes you see in advance the risks that optimism hides.
— Devil's advocate. Deliberately look for arguments AGAINST your decision (or ask someone else to). A direct antidote to confirmation bias.
— The outside view (base rate). Not “our case is special” but “how do projects like this usually turn out for others?” Other people's statistics are a sobering check on optimism.
— A pause and sleep. For important decisions — put it off and sleep on it. This gives System 2 a chance to catch up with System 1.
The point is simple: don't trust the first confident answer; run it through questions prepared in advance.
Five questions before you conclude
A summary checklist that's easy to keep in your head. Before you believe or decide, run the thought through five questions.
1. How do I know this? Is it a fact, an opinion, or a feeling? Is there a source; can it be checked?
2. What would prove the opposite? What fact would show I'm WRONG, and did I look for it (protection against confirmation bias)?
3. Who am I NOT seeing? Where are the “dead” data, the failures, the silent side (protection against survivorship bias)?
4. How rare is this? Have I forgotten the base rate; am I confusing “neat” with “likely”?
5. Who benefits, and is someone pushing on my emotions? Is there urgency, fear, a false “either-or” (protection against manipulation)?
You don't need to run every little thing through this — your brain wouldn't have the energy, and there's no need. But for important decisions, loud news, and heated arguments, these five questions protect you from most typical errors.
The main skill of the whole course: notice a fast, confident, emotional conclusion in yourself — and right then slow down and ask, “Are you sure?”