General objectives were to develop and implement computer-based procedures for obtaining validated data on the characteristics of vocational school students and to convert this data into counseling information. Two types of data-information conversion procedures were field-tested: similarity scores based on discriminant analysis, and success estimates based on regression analysis. Scores from 36 aptitude, interest, and personality measures were accumulated for approximately 1600 prospective area vocational school students. A progress record was kept for each of these students after vocational school enrollment. Multivariate analyses conducted on antecedent and criterion data formed the bases for data-information conversion procedures used in the field tests. It is concluded that: (1) Successful and satisfied students enrolled in diverse vocational programs can be differentiated by aptitude, interest, or personality measures obtained prior to or shortly after entry into the programs; (2) Similarity scores and profiles represent effective tehcniques for translating data on these differences into useful counseling information; (3) useful estimates of vocational program success can be conveyed to students in the form of experience tables based on the best predictors in a comprehensive battery of aptitude measures; and (4) The development of a generalized system of computer-based procedures for data-information conversion is both feasible and desirable. (Author/PR)