A personality inventory was developed as an aid in securing history and beliefs relevant to the assessment of personality structure and the diagnosis of personality disorders. The inventory was developed by restating DSM diagnostic criteria in everyday language, rewording the resulting statements in the form of True/False questions, and placing these questions in a short, self-paced booklet which subjects could complete in about 15 minutes. The following assessments were made and discussed: construct validity, split-half reliability, test-retest reliability, comparison with a standardized interview, and comparison with actual clinical assessments. The personality inventory is discussed as a useful accompaniment to the diagnostic interview in clinical settings and for research into personality structure and personality disorders.