Intelligence Quotient (IQ)

## What is IQ?

Standardized cognitive measure (mean 100, SD 15). First tests: Binet and Simon (1905). Measures fluid reasoning, knowledge, working memory and processing speed.

## Controversies

Good predictor but doesn't measure creativity or EQ. Flynn effect — scores rise across generations.

## How is it measured?

**WAIS** and **Raven's Progressive Matrices**.