![]() With content validity, the test or technique used actually measures the content or areas that are most important. Face validity refers to a test or technique appearing to measure what it should measure. ![]() Validity can be divided into five categories. Validity refers to the degree to which a technique or test measures what it is designed to measure. In the last category, inter-rater reliability, two or more psychologists (or “raters”) must come to similar conclusions about the patient’s diagnosis.Īssessment must also be valid. With internal reliability, different parts of a test must produce similar results. The first category, test-retest reliability, requires that the psychologist obtain similar results with the same patient at two different points in time. ![]() Reliability can be divided into three categories: test-retest, internal, and inter-rater. With reference to psychological testing, reliability relates to the degree to which a measurement is consistent. For this reason, assessment must be reliable. The initial assessment provides a baseline for later comparison and makes possible checking the effectiveness of the ongoing treatment to see if adjustments are necessary. The importance of the initial assessment is great.
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