The theoretical grounds for the Millon Clinical Multiaxial Inventory (MCMI) are noted, as are the purposes and features of the inventory. Specified also are the rationale and procedures for constructing the component scales. Both uses and limitations of the instrument are recorded. Steps to be followed in making configural interpretations are recommended. Also reported are results of evaluative research. These point to the general soundness of the MCMI as a clinical tool, as well to areas where ongoing studies may further strengthen its utility in the counseling context.

The elements that constitute a scientific taxonomy are outlined and presented with reference to the structure of psychopathologic categorization and diagnosis. The terminology, logic, and conceptual issues associated with clinical classification are discussed. Alternatives for the selection of substantive clinical attributes, the overall structural format into which categories are organized, and construction procedures used in developing a psychopathologic taxonomy are elaborated, as are a number of criteria for evaluating the taxonomy's utility and efficacy.

Although the arguments that Widiger, Williams, Spitzer and Frances muster in their appraisal of MCMI-DSM-III relationships appear compelling, the study employed to furnish empirical support for their thesis may be seriously flawed and the item content approach they propose as a validation model is judged logically and psychometrically deficient. A rejoinder with supportive data are presented to demonstrate both the substantive parallels and the clinical concordance that exist between MCMI and DSM-III criteria. On the basis of theory development and ongoing research, a new MCMI-II assessment instrument will be forthcoming. A brief summary of this updated inventory's rationale and empirical grounding is provided.

Both the original Millon Clinical Multiaxial Inventory (MCMI-I; Millon, 1977) and the Millon Clinical Multiaxial Inventory-II (MCMI-II; Millon, 1987) were refined and strengthened on a regular basis by both theoretic logic and research data. This aspiration has continued. The new Millon Clinical Multiaxial Inventory-III (MCMI-III; Millon, 1994) has been further coordinated with the most recent official diagnostic schema, the Diagnostic and Statistical Manual of Mental Disorders (4th ed., [DSM-IV]; American Psychiatric Association [APA], 1994) in an even more explicit way than before. Although the publication of the first version of the MCMI preceded the publication of the DSM-IV, its author played a major role in formulating the official manual's personality disorders, contributing thereby to their conceptual correspondence. The DSM-III-R (APA, 1987) was subsequently published in the same year as the MCMI-II; the inventory was modified in its final stages to make it as consonant as possible with the conceptual changes introduced in the then forthcoming official classification. The present version of the MCMI, the MCMI-III, strengthens these correspondences further by drawing on many of the diagnostic criteria of the DSM-IV to serve as the basis for drafting the inventory's items. This article reports on a select set of theoretical and empirical developments that are being carefully weighed for possible inclusion in future MCMIs, or as a guide in the refinement process of future MCMIs.