“…The usual purpose of making a diagnosis is that it directs the selection of treatment (e.g., Korchin & Schuldberg, 1981, stated that ''the basic justification for assessment is that it provides information of value to the planning, execution and evaluation of treatment,'' p. 1154; see also Hayes, Nelson, & Jarrett, 1987). Often, ''differential'' diagnosis is essential to ensure that treatment addresses the appropriate disorder.…”