

A reliable measurement on the other side occurs when it yields similar values across repeated or recurring measurement of an event (Fisher, Piazza & Roane, 2011).

Accurate measurement happens when the observed values of an event relate to the values of an event. Validity measurement occurs when the measurement is expected to be focused on a specific dimension of socially significant behavior. The information is used to provide sustainable intervention related to the patient's functional deficits. The behavioral assessment has been used to identify fundamental strengths and weaknesses of a patient and identify the development of issues in social, emotional and physical performance. For data to be useful in a psychological assessment session, there is a need for it to be accurate, valid and reliable.

Many applied behavior analysis (ABA) relies on the assessment of the behavior.
