1. Relabeling Validity

2. Some History 1963 - Campbell & Stanley

3. Some History 1963 - Campbell & Stanley Two types of validity - Internal - External

4. Some History 1963 - Campbell & Stanley Two types of validity: - Internal - External 1979 - Cook & Campbell

5. Some History 1963 - Campbell & Stanley Two types of validity: - Internal - External 1979 - Cook & Campbell InternalExternal

6. Some History 1963 - Campbell & Stanley Two types of validity: - Internal - External 1979 - Cook & Campbell InternalExternal ConclusionInternalConstructExternal

7. Relabeling Internal Validity Internal Campbell, 1986

8. Relabeling Internal Validity Internal Local modal causal validity Campbell, 1986

9. Local Modal Causal Validity Only applies to current study -- zero generalizability Can apply to hodgepodge composite programs Still concerned with ruling out alternative explanations Local Modal Causal

10. Relabeling External Validity External Campbell, 1986

11. Relabeling External Validity External The principle of proximal similarity Campbell, 1986

12. Principle of Proximal Similarity A reaction to the sampling theory of generalizability Based on the natural science model of high internal validity Places current study within a generalizability space Views generalization as a question of degree

13. Proximal Similarity OurStudy

14. OurStudy TimesPeople Places Settings

15. OurStudy TimesPeople Places settings Lesssimilar Lesssimilar Lesssimilar Lesssimilar

16. OurStudy Timespeople Places Settings Lesssimilar Lesssimilar Lesssimilar Lesssimilar Gradients of Similarity