People's beliefs about the origins of their health, sometimes referred to as health locus of control, have been shown to influence a variety of important behaviors, including the propensity to engage in effective health maintenance activities, and the willingness to seek and follow medical advice. The purpose of this study was to explore the nature of health locus of control beliefs of children and to examine the construct validity of the Multidimensional Health Locus of Control Scales (MHLC). The subjects constituted two discrete samples of children in grades four, five, and six. The first sample (N=914) completed the MHLC Scales with simplified sentence structure for some items to improve the usability of the measure with this age group. The second sample (N=390) completed the same modified version of the MHLC Scales and an additional six items from a second measure. Confirmatory maximum-likelihood factor analyses were conducted, and a confirmatory factor analytic analog to analysis of variance was illustrated. Results were generally supportive of the validity of data collected using the MHLC Scales, though some additional item revisions are suggested. (Author/NB)