A proficiency model that provides information on individuals' mastery status on specific skills is illustrated. The model describes the construction and scoring of mastery tests as well as the organization and reporting of individual and group testing results. With the model, an individual's mastery status with respect to various skills can be represented by a victor with n elements, where n equals the number of skills tested. This multivariate quantitative data is analyzed by the log-linear model, incorporating both a sampling factor and a response structure. Thus, the model provides test statistics to assess the differences in capability of the sampled groups as well as the structure represented by the response factors. Two examples are presented which illustrate the applicability of the model in the analysis of proficiency assessment results. The log-linear model permitted a concise analysis of data arising from the use of mastery measurements. (Author/GK)