A clinical psychologist is using a particular diagnostic classification system to diagnose a psychological disorder. She finds that her system yields consistent results but, unfortunately, it does not appear to be accurately assessing the disorder in which she is interested. This would mean that her classification system is

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The classification system is reliable because it yields consistent results, but it is not valid because it does not accurately assess the disorder of interest. Reliability refers to consistency, while validity refers to the accuracy of measuring what it is supposed to measure.

A Clinical Psychologist Is Using a Particular Diagnostic Classification System