3. What 3 kinds of validity must research have to provide useful information about theories?
1. Because theories deal with constructs- abstract concepts-researchers have to be sure the specific observations they make in their studies are in fact relevant to those constructs,
2. Because theories describe causal relations, researchers have to be sure they know the causes of any changes in behavior they find in their studies.
3. Because theories are general in scope, researchers have to be sure they have learned something about how people in general, not just a few individuals think, feel, and act.