Idiographic & Nomothetic Approaches

The idiographic-nomothetic debate concerns how psychology should study people. Should we focus on understanding the unique individual in depth (idiographic), or should we seek to establish general laws that apply to everyone (nomothetic)? Both approaches have strengths and limitations, and most modern psychologists argue that they are complementary.

Key Definition: The nomothetic approach aims to study human behaviour by establishing general laws and principles that apply to large groups of people, using quantitative methods and large samples.

Key Definition: The idiographic approach aims to describe and understand the unique individual in depth, using qualitative methods and detailed case studies.

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The Nomothetic Approach

The nomothetic approach seeks to discover universal laws of human behaviour — patterns and principles that apply to all people or to large populations. It uses:

• Quantitative methods: experiments, surveys, standardised tests, psychometric measures.
• Large samples: to establish statistical norms and generalisable findings.
• Statistical analysis: to identify significant differences, correlations, and effect sizes.
• Controlled conditions: to isolate variables and establish cause and effect.

Approaches That Use the Nomothetic Method