“…Clinical interviewing is of limited usefulness, so assessment must rely heavily on information from caregivers, and treatment records, as well as observation. Diagnosis in the absence of a full verbal account by the patient does, however, pose validity problems (Moss et al, 1996b). To maximize diagnostic validity, multiple perspectives on the individual's behavior must be coupled with carefully structured methods for recording symptoms, encompassing all the variables that influence an individual's behavior (e.g., biomedical, psychological, interactional, environmental) (Gardner and Sovner, 1994;Griffiths, 1995;Moss and Lee, 2001).…”