Clinical assessment: systematic evaluation and measurement of psychological, biological and social factors in an individual presenting with a possible psychological disorder. Diagnosis: process of determining whether the particular problem afflicting the individual meets all criteria for a psychological disorder. Begin by asking patient to describe the issues that brought him or her to the clinic in the first place. Ask questions pertaining to present life circumstances to get a better picture of the patient"s current situation. Process of assessment like a funnel; begin by collecting lots of information across a broad range of functioning to determine the source of the problem. After getting a sense of overall functioning, narrow the focus by ruling out problems in some areas and concentrating on areas that seem most relevant. Value of assessment depends on: validity, reliability and standardization: reliability: degree to which a measurement is consistent. Ensuring that two or more raters will get the same answers is interrater reliability.