The Skills Map, a comprehensive classification of occupations based on their competency requirements, was developed to assess the employability of individuals and of various groups of individuals in different types of occupations. The data on which it was based were the ratings of required worker traits as given by the Dictionary of Occupational Titles (DOT). The practical and theoretical usefulness of the classification was examined according to seven criteria: valid job descriptors, comprehensive occupational coverage, comprehensive aptitude coverage, a comprehensible map of job differences, parallel assessment of people and jobs, a link to demographic data, and multiple levels of analysis. Data for job descriptor validity were positive but inadequate. The DOT ratings provided quite comprehensive coverage of jobs and reasonable coverage of academic and motor, but not interpersonal, aptitudes. Map structure was readily comprehensible. A way to assess jobs and people in parallel ways was not provided. The Skills Map was readily linked to demographic data available according to the Census Bureau's 1970 classification of occupations. It provided a global classification of occupations according to their general differences and additional detail about the aptitudes and activities that individual occupations require. (Appendixes amounting to approximately one-half of the report provide materials and data used in the analyses.) (YLB)