Do not confuse validity of an experiment (as a research method) and validity of diagnosis. The idea is similar:

experiments are said to be valid if they study what they are supposed to study; diagnosis is said to be valid if it taps into the real problem. However, all the other aspects are dierent. For example, the terms “external validity”, “internal validity”

and “construct validity” can be applied to experiments, but not to diagnosis. Also discuss these dierences.

● How do we ensure sucient validity in experiments? And in diagnosis?

● What are the consequences of low validity in experiments? And in diagnosis?