[Phenomenology of obsessions and compulsions. Experimental diagnosis of obsessive compulsive neurosis. I (author's transl)].

Obsessive-compulsive phenomena occur in 'normal,' neurotic and psychotic individuals. Operational definition, quantitative assessment, and diagnostic evaluation are still unsatisfactory, particularly with regard to differentiation of obsessive-compulsive phenomena (phenomenology), differentiation of trait and symptom factors, and evaluation of different obsessive-compulsive factors in the various kinds of neuroses. Our investigation of phenomenology differs from previous similar ones in basically two aspects: The newly developed obsessive-compulsive checklist covers the whole range of obsessions and compulsions, and questionnaire items of the checklist are operationally difined without reference to constructs from theories of personality or from psychopathology. Results include: Two-thirds of all patients suffer from combined obsessions and compulsions; factorial analysis reveals five symptom factors which are quite different from factor analytic results of previous studies; depression and phobias constitute a factor by themselves; checklist ratings and factor analytic results show the necessity for and basis of a new self-rating questionnaire to substitute for those currently in use. Implications of these results for future research in psychopathology as well as treatment evaluation are discussed.