All borderline patients admitted at a day hospital during a 6-year period were followed up with a postal questionnaire after 3-10 years. Patients who had chosen to leave the treatment within 4 months were analyzed as a separate group, and these drop-outs and the remaining patients were compared with a group of well-adjusted people who were assumed to represent the functional norm. The patients who remained in treatment were clearly posited at a level of functioning between the norm and the drop-outs, although the variation among them was quite large. Depending on the stringency and content of the criterion of clinical significance, 25-75% of the patients remaining in treatment fell within the range of the norm group versus 20-50% of the drop-outs. The patients who had benefited most since termination had differed favorably from the other patients already at admission to treatment, but not as much as had the drop-outs. The drop-outs, however, at admission also had more ambivalent or negative attitudes towards treatment.