# Dual Process Theory Dual Process Theory proposes that cognition operates through two distinct systems: **System 1** (fast, automatic, intuitive, effortless) and **System 2** (slow, deliberate, analytical, effortful). Popularized by [[Daniel Kahneman]] in *[[Thinking Fast and Slow (book)]]*, the framework explains why we make predictable errors—System 1 generates quick judgments that System 2 often accepts without scrutiny. System 1 excels at pattern recognition, intuition, and routine decisions but produces systematic biases. System 2 can override System 1 but requires effort and is easily depleted. Most thinking is System 1; we only engage System 2 when surprised or when stakes are high. The theory influences [[Behavioral Economics]], [[Nudge Theory]], and understanding of cognitive biases. ## The Two Systems | System 1 | System 2 | |----------|----------| | Fast, automatic | Slow, deliberate | | Effortless | Effortful | | Intuitive | Analytical | | Prone to biases | Can override biases | | Always on | Lazy, easily depleted | ## References - Kahneman, Daniel. *[[Thinking Fast and Slow (book)]]* (2011) - Stanovich, Keith. *Rationality and the Reflective Mind* (2011) ## Related - [[Daniel Kahneman]] - [[Intuition]] - [[Cognitive Biases]] - [[Heuristics]] - [[Behavioral Economics]] - [[Thinking Fast and Slow (book)]]