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Experimental Research (Criteria for a Well- Designed Experiment (Basis for…

- - - - Basic minimum of control
      - Result is explaining the effect
    - - Maturation
      - Testing
      - History
      - Instrumentation
      - Statistical regression
      - Differential selection of subjects
      - Experimental mortality
      - Selection
  - - - Deals with the extent of generalisability of the results
    - - Interaction effects of selection biases & experimental treatment
      - Reactive effects of experimental arragement
      - Interaction effect of testing
      - Multiple-treatment interference
- - - - Internal validity: differential selection of subjects
      - External validity: intact group