The Multidimensional Health Locus of Control (MHLC) scales have been used both to evaluate program effects and to assign subjects to treatment modalities. This study explored the construct validity of scores from the MHLC scales when the measure is used with adults who solicit intervention to promote their own health. The MHLC measures health locus of control along multiple dimensions (powerful others, chance, and internal). Subjects were 692 adult faculty or staff members (mean age 41.3 years) at a large southwestern state university who were seeking voluntary health promotion services. There were approximately equal numbers of men and women. Principal components analysis found that the 3 factors (dimensions) accounted for 41.5% of the total variance. Overall, results support the three-dimensional structure set forth by the test developers. All but 1 of the 18 items from the scales loaded on the appropriate a priori subscales. Results suggest that the instrument tends to yield valid scores when used with adults seeking voluntary health promotion activities. One tables presents study findings. A 30-item list of references is included. (SLD)