
A Practitioner's Guide to Psychology Test Types and Clinical Validity
The most persistent misconception in psychometrics is that an instrument measures what a subject actually does. It does not. A valid assessment evaluates the structural motivations and cognitive mechanics that make a specific behavior likely, not the behavior itself. If a clinician wants to know if a patient is organized, they ask to see their desk. If they need to understand why the patient feels intense occupational stress despite being highly organized, they deploy a psychology test. The lens




