Dual-Process Theory

Overview

Dual-process theory (Kahneman, 2011; Stanovich & West, 2000) distinguishes two modes of cognitive processing: System 1 (fast, automatic, heuristic-driven) and System 2 (slow, deliberate, rule-based). Most judgments default to System 1, which is efficient but prone to systematic biases when heuristics misfire.

When to Use

• Explaining why stakeholders make predictable judgment errors under time pressure or complexity
• Designing decision environments (nudges, checklists) that compensate for System 1 defaults
• Auditing existing processes to identify where heuristic shortcuts introduce risk
• Evaluating when intuitive expertise is reliable vs. when it is misleading

When NOT to Use

• When decisions are already well-structured with algorithmic procedures (bias is engineered out)
• As an excuse to dismiss all intuitive judgment — expert intuition can be accurate in high-validity environments
• When the problem is motivational rather than cognitive (people know the right answer but choose otherwise)