The assessment of ego development in borderline personality disorders.

The purpose of the study was to assess levels of ego functioning in a cohort of patients who met the criteria for borderline personality disorder. The Sentence Completion Test (SCT) and the Descriptions of Significant Others (DSO) test were used to measure dimensions of ego maturity. The borderline patients' responses on the SCT were compared with the responses of an outpatient sample of psychiatric patients and with general population norms established for the test. The scores on the SCT for a selected subgroup of five subjects were compared with their scores on the DSO. Contrary to expectation, the responses on the SCT by those with borderline personality disorder did not differ from those for the psychiatric outpatient sample or the general population norms. However the within-group comparisons between the SCT and the DSO for the subgroup of five subjects showed comparable trends between tests. Discussion of the results focuses on the interpretations of the borderline patients' responses to the two tests. Emphasis is placed on the need to distinguish subsets of ego functions, which can be assessed separately using a variety of measurement strategies.