Although extensively used in the assessment of sexual offenders, the Multiphasic Sex Inventory (MSI) has not been the subject of psychometric evaluation. This article provides internal consistency, convergent and divergent validity, and redundancy analyses for the MSI. Data were obtained from three independent samples of incarcerated sex offenders and two independent samples of nonincarcerated sexual offenders. The results show that the MSI provides information not tapped by traditional psychological tests. Also, the MSI scales demonstrate moderate to high levels of internal consistency, and considerable convergence and divergence with other measures. The MSI's most notable limitations are its face validity and potential contamination by response biases. Suggestions for clinical use and further research are provided.
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