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This study aimed to develop an instrument for personality disorders assessment and seek for validity evidence based on the internal structure of this instrument. The developed instrument, the Dimensional Inventory of Personality Disorders (IDTP), was applied to 350 participants, from 1 8 to 67 years, of both sexes. First and second order exploratory analyzes by principal components were performed, correlations between the scales of the instrument, and calculated the alpha’s Cronbach coefficients. According to the literature and specifically the diagnostic categories for personality disorders, most hypothesized factors were found for the test and the alpha coefficient ranged between .65 and .89. Furthermore, the secondorder factor structure, consisting of three factors, was consistently according to prior literature.