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Abstract
The similarity between typological systems based on the MMPI and CPI was investigated in a sample of male heroin users. The typologies had faiily high classification rates (85 and 75%, respectively) and evidenced relationships that seem consistent with psychological theory. Methods of using the two inventories and the respective typological systems in tandem were suggested, and the possibility of predicting the configural patterns of one inventory from those of the other was explored.