Millon Adolescent Personality Inventory

Purpose: Designed as an objective personality measure for adolescents.

Population: Ages 13 to 18 years.

Score: 8 personality-style dimensions.

Time: Not reported.

Authors: Theodore Millon, Catherine J. Green, and Robert B. Meagher, Jr.

Publisher: NCS Professional Assessment Services.

Description: The Millon Adolescent Personality inventory (MAPI) is an objective personality measure of the true-false type that assesses a number of personality dimensions, expressed concerns, and behavioral correlates in adolescents aged 13 to 18 years.

Scoring: The inventory comprises eight scales measuring personality styles based on Millon’s theory of personality types; four scales designed to tap subjects’ expressed concerns, such as peer security and acceptance of sexual maturation; and four scales assessing subjects’ actual behavior. The MAPI yields normative scores that are adjusted for personality-trait-prevalence data on each of the personality style, expressed concern, and behavioral correlate scales. A narrative report interprets scores on each of the three sets of scales, identifies noteworthy responses to individual items, lists applicable DSM-III-R diagnoses, and discusses therapeutic implications for use in treatment planning.

Reliability: Two test-retest studies produced stability coefficients generally within the acceptable range. An analysis of the internal consistency of all 20 MAPI scales produced a median reliability coefficient of .74, with a range from .67 to .84. The findings are within the acceptable range for scales of this type.

Validity: Internal validity was established by employing statistical correlation of each of the 150 test items with total scores on each of the 20 scales, subsequent to completion of the initial scale-construction stage. Those test items that displayed a moderate correlation (usually .30 or higher) with any scale other than a theoretically incompatible one were added to that scale. Further validity research was undertaken subsequent to the completion of the final form of the MAPI. In general, the 20 individual scales of the MAPI display moderate correlations in the expected direction with relevant scales of the California Psychological Inventory, 16 PF, and the Edwards Personal Preference Schedule.

Norms: The test was normed on groups of "clinical" and "nonclinical" subjects ranging

in age from 13 to 19 years. The normal group consisted of 1,071 males and 1,086 females enrolled in public and parochial schools in a number of cities in various parts of the United States. The clinical group consisted of 430 adolescents, of whom 325 were outpatients and 105 were inpatients. The sample was 84% white, 11% black, 3% Hispanic, 1% Oriental, and 1% other. The standardization sample roughly matched the estimated percentages for socioeconomic status groups within the general population.

Suggested Uses: The MAPI is recommended for use in clinical and research settings.