Dual-Process Theory

Assumptions

IRON LAW: System 1 operates by DEFAULT — System 2 engagement
requires cognitive effort and is easily depleted. Under time
pressure, cognitive load, or ego depletion, System 1 dominates
and heuristic biases amplify.

Key assumptions:

1. System 1 and System 2 are metaphors for processing modes, not discrete brain systems
2. Heuristics are generally adaptive — biases emerge at the boundary conditions
3. System 2 can override System 1, but only when cued and when cognitive resources are available

Methodology

Step 1 — Identify the Judgment or Decision Context

Characterize the decision: time pressure, complexity, familiarity, stakes, emotional involvement.

Step 2 — Classify Processing Mode

Step 3 — Map Relevant Heuristics and Biases

Common System 1 heuristics and their failure modes:

• Availability: judge frequency by ease of recall — biased by salience and recency
• Representativeness: judge probability by similarity — ignores base rates
• Anchoring: estimate by adjusting from initial value — insufficient adjustment
• Affect: judge risk/benefit by emotional reaction — neglects statistical evidence

Step 4 — Design Intervention

• De-bias: slow down decisions, require explicit justification, use pre-mortems
• Nudge: restructure choice architecture to align System 1 defaults with desired outcomes
• Leverage: use System 1 strengths (pattern recognition) in high-validity, rapid-feedback domains

Output Format

## Dual-Process Analysis: [Context]

### Decision Environment
- Time pressure: [High/Medium/Low]
- Complexity: [High/Medium/Low]
- Emotional involvement: [High/Medium/Low]
- Dominant processing: [System 1 / System 2 / Mixed]

### Heuristic-Bias Map
| Heuristic | Bias Triggered | Evidence | Risk Level |
|-----------|---------------|----------|------------|
| [heuristic] | [bias] | [observation] | [High/Med/Low] |

### Intervention Design
1. [De-biasing or nudge strategy]
2. [Process change]
3. [Environmental redesign]

Gotchas

• System 1/System 2 is a useful metaphor, not a literal brain architecture — avoid reifying the distinction
• Expert intuition (System 1) is highly accurate in domains with clear feedback and regular patterns (e.g., chess, firefighting)
• De-biasing training has poor transfer — changing the environment is more effective than training individuals
• Cognitive depletion effects are debated; do not assume a simple "willpower battery" model
• System 2 is not inherently "better" — it is slower, more costly, and still subject to motivated reasoning
• People often confuse confidence with accuracy; high System 1 confidence does not indicate correctness

References

• Kahneman, D. (2011). Thinking, fast and slow. Farrar, Straus and Giroux.
• Stanovich, K. E. & West, R. F. (2000). Individual differences in reasoning: implications for the rationality debate. Behavioral and Brain Sciences, 23(5), 645-665.
• Tversky, A. & Kahneman, D. (1974). Judgment under uncertainty: heuristics and biases. Science, 185(4157), 1124-1131.