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Thinking, Fast and Slow

by Daniel Kahneman

Thinking, Fast and Slow

An original analysis of the ideas in Thinking, Fast and Slow by Daniel Kahneman

An exploration of how the mind runs on two systems, a fast intuitive one and a slow deliberate one, and why the fast system's shortcuts produce reliable, repeatable errors of judgement.

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The short analysis

The framing organises a lifetime of research around a simple distinction: one mode of thinking is fast, automatic, and effortless, and the other is slow, deliberate, and demanding. Most of the time the fast mode runs the show, and most of the time that is fine, because its snap judgements are usually good enough. The trouble is that its shortcuts are not random; they fail in patterned ways that we can name and anticipate. We judge how likely something is by how easily an example comes to mind, we anchor on whatever number we saw first, and we let the way a choice is framed flip our preference even when the underlying facts are identical. We are also far more sensitive to losses than to equivalent gains, which warps everyday decisions about risk. The slow mode could catch these mistakes, but it is lazy and tires quickly, so it tends to endorse whatever the fast mode has already proposed. Recognising the situations where intuition is untrustworthy, and deliberately slowing down in exactly those moments, is the practical payoff.

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The full analysis

An exploration of how the mind runs on two systems, a fast intuitive one and a slow deliberate one, and why the fast system's shortcuts produce reliable, repeatable errors of judgement.

1. Two systems, two speeds

One mode of thought is quick and intuitive and the other is slow and effortful. The quick one generates impressions and feelings; the slow one can check them but rarely bothers. Knowing which mode a situation calls for is the first step toward better judgement.

Why it matters: Many errors come from letting fast intuition answer a question that deserved slow analysis.

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