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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
3. Contexts
4. Extensions (HL only)
1.4.1 Operationalization of variables
4 minute read
1.4.2 Data collection methods
8 minute read
1.4.3 Reliability and validity of measures
7 minute read
