PROBLEMThe literature is replete with predictive studies of suicidal behavior based upon psychological tests. Those investigations that have dealt with self-concept in efforts to distinguish between suicidal and nonsuicidal psychiatric patients, however, were not based on standardized measures(e.g.o 4 ) . This study attempts to demonstrate self-concept differences between patients who attempt suicide and those who do not, and that an individual's concept of self, assessed prior to a suicidal act, is a highly effective predictor of that act.