**We think in two modes** Humans have two basic modes of thought: # [[System 1]] System one operates automatically. Doing fast calculations and quick judgments. System one is imperfect. [[Snap Judgments]] are from System 1. # [[System 2]] System two is calculating, but fundamentally lazy. Following [[Checklists]] or procedures requires engaging system 2. Each mode has its purpose, its strengths, and its weaknesses. See their respective notes. **** ## Source - [[Thinking Fast and Slow]] ## Related - [[Bias Index]] - [[Snap Judgments]]