System 1 and 2
System 1 and System 2 are labels for two broad modes of thinking: fast, automatic and intuitive, and slow, deliberate and effortful. The terms come from Keith Stanovich and Richard West and were made famous by Daniel Kahneman in Thinking, Fast and Slow (2011). The distinction is a useful picture rather than a literal description of the brain, and researchers continue to refine it. It helps explain why quick judgments are often right and sometimes wrong, and when slowing down pays. This page gathers our articles, quizzes and videos on fast and slow thinking.
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System 1 and 2Reasoning Habits CheckPuzzles that reward a second look. How often do you check your first answer?This quiz checks how often you stop and test your first answer on short reasoning puzzles covering numbers, logic, chance, careful reading and estimating. It is not an IQ test and does not measure intelligence. It describes a habit, which can be changed.10 questions · 4 minSystem 1 and 2System 1 vs System 2 ThinkerDo you trust your gut or check your work? See which mode runs your decisions.This quiz explores how much your thinking runs on fast, automatic judgment versus slow, deliberate effort, and through which door the fast mode takes over: snap judgments, ease, easier-question swaps, confidence in stories, or avoiding effort. System 1 and System 2 are a useful picture, not literal parts of the brain, and nobody thinks in one mode.10 questions · 4 min