John L. Holland has developed a theory which states that people can be characterized by their resemblance to each of six personality types: realistic, investigative, artistic, social, enterprising, and conventional. Holland further indicates that the environments in which people live can be characterized by their resemblance to six model environments which correspond to the six personality types. Finally, the pairing of persons and environments leads to predictable outcomes relative to vocational choice, vocational stability and achievement, educational choice, and susceptibility to influence. The purpose of this study was to determine the extent to which Holland's model of occupational classification could be applied to an inner-city high school population. In order to determine the applicability of Holland's model to the population being tested, four hypotheses were formulated. 1. There are significant relationships between the occupational classifications of Holland's model when applied to an inner city high school population. 2. There are significant relationships between the intercorrelations of the occupational classifications of Holland's national sample and the intercorrelationR of the occupational classifications of the present study. 3. There is a significant relationship between the rank ordering I of the intercorrelations of the occupational classifications of Holland's study and the rank ordering of the intercorrelations occupational classifications of the present study. 4. There are dominant personality types in an inner-city high school population as measured by the Vocational Preference Inventory. The subjects for the study were 492 high school sophomores (218 male, 274 female) from Region I of the Baltimore PublicSchool System. To test the first hypothesis, data collected by the VPI were treated by the correlation program BMDO3D. This treatment resulted in a correlation matrix. The data were then displayed on a hexagonal model. The relationships among the scales on the hexagon were treated by ...