Evidence based on Relations to Other Variables
Traditionally: convergent validity, discriminant validity, predictive validity, concurrent validity, criterion validity, external validity.
How does your score relate to others? How should it be? What groups should perform differently than others?
Convergent/Discriminant evidence: What is the agreement between your test and another that should or should not be related?
Test-criterion relationships: How well do test scores predict some criteria?
Generalization: How well can evidence be generalized to other settings?