The more common methods of measurement in clinical psychology include interviews, rating scales, standardized tests, self-monitoring, behavioral observation, and psychophysiological procedures. These methods can be designed to provide specific information on the facets, modes, and dimensions of the particular problem for multiple sources in multiple settings across multiple occasions. The development of interviews, rating scales, observational systems, and self-monitoring procedures with similar facets, modes, and dimensions for conceptually related constructs (e.g., anxiety and depression; ADHD and ODD) would facilitate research on such constructs. Such highly specific measures would also allow better clinical decisions about individual clients (e.g., Haynes & O'Brien, 2000, chaps. 6 and 7).
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