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1. Concepts
1.1 Bias
1.2 Causality
1.3 Change
1.4 Measurement
1.5 Perspective
1.6 Responsibility
2. Content
2.1 Biological Approach
2.2 Cognitive Approach
2.3 Sociocultural Approach
2.4 Research Methodology
3. Contexts
3.1 Health and Well-being
3.2 Human Development
3.3 Human Relationships
3.4 Learning and Cognition
4. Extensions (HL only)
4.1 Culture
4.2 Motivation
4.3 Technology
4.4 Data Analysis and Interpretation
Reliability
The consistency of a measure across occasions, coders, or items.
Validity
The extent to which a measure accurately reflects the construct it is intended to measure.