# Dual processing theory

> IB Psychology · IB Psychology 2027 First Assessment
> Source: https://www.owlsprep.com/study/ib-psychology-cog-dual-processing-theory/

The role of the dual processing theory in understanding decision-making.

## Learning objectives

- The role of the dual processing theory in understanding decision-making.

## How often is this tested?

Based on OwlsPrep's analysis of official CIE IB_PSYCH P1 past papers (2019–2025): **Dual processing theory** appears **2 times** in the last 7 years — **0.9%** of all P1 questions (2 of 228).

Most-tested forms: SAQ: Explain (9 marks) (2).

*Small sample — indicative only.*

## Core concept

Dual-processing theory says thinking runs on two systems. System 1 is fast, automatic, intuitive and effortless; System 2 is slow, deliberate, analytic and effortful. Everyday judgements lean on System 1, which is efficient but prone to systematic biases; System 2 can override it but is easily 'lazy'. The model explains why capable people still make predictable reasoning errors.

## Key studies

IB Psychology answers must be supported by named studies. Learn these to cite as evidence:

**Tversky & Kahneman (1981)** — People reversed their risk preferences depending on whether identical outcomes were framed as gains or losses. — *The framing effect shows fast, intuitive System-1 processing overriding consistent, rational choice.*

## Evaluation (AO3)

**Strength — unifying and predictive** — One model organises many separate biases and predicts when errors appear (under time pressure, low effort).

**Limitation — a metaphor, not two brain systems** — 'Two systems' is a useful simplification; the sharp dichotomy is debated and may overstate how separate the processes really are.

## Scope

> **note**
>
> The model of thinking/decision-making is the focus; individual biases are COG_1/COG_5; memory models are COG_4.

## Common pitfalls

- **Wrong:** Describing a bias (anchoring, framing) without presenting the dual-processing model it belongs to.
  - Why it fails: A frequently penalised misconception in IB Psychology exams.
  - Correct: For thinking-and-decision-making questions the dual-processing model is the core answer; the biases are the supporting evidence for it.

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