Valid refers to the degree to which a measurement or assessment accurately measures what it is intended to measure. In the context of psychology, validity refers to how well a psychological construct or diagnosis captures and represents the true nature of an individual's experiences or behaviors.
Refers to the consistency and stability of a measurement or assessment. It ensures that if we were to repeat the measurement, we would get similar results each time.
Construct Validity: This term refers to whether a test accurately measures the specific psychological construct or trait it claims to measure.
Criterion Validity: Refers to how well a test predicts or correlates with an external criterion or outcome. If a test has high criterion validity, it means that scores on the test can accurately predict certain outcomes.