According to the authors of the proposal the new category "addressed problems of a religious or spiritual nature that are the focus of clinical attention and not attributable to a mental disorder". In their view there exist criteria for differentiating between spiritual problems and mental disorders such as psychosis. This concern is also addressed in the DSM-IV Sourcebook. According to Lukoff and Lu, co-authors of the category, religious or spiritual problems are not classified as mental disorders. Foulks also notes that the new diagnosis is included in the DSM-IV-TR nonillness category (Other Conditions That May Be a Focus of Clinical Attention).