Reliability and Validity with regard of diagnosing disorder

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• 2. The extent to which a disorder has the same causes, which can be established by examining what is known about the causes of the disorder and matching it with the patient’s history. (12, 8)
• 3. The extent to which a measure of a psychological variable measures what it sets out to measure. (8)
• 4. Whether or not a classified disorder is actually a good indicator of what you are really trying to measure. (9, 8)
• 5. The consistency with which a measure of psychological variable identifies the same thing. (11)
• 6. The extent to which results from a test such as DSM, or a study can predict future behaviour. (10, 8)