In 1958 the United States Employment Service initiated a longitudinal maturation study to investigate the effects of maturation on General Aptitude Test Battery aptitude scores. The sample consisted of 20,541 students tested initially in lower high school grades (9, 10, and 11) and retested in Grade 12 and 6,167 students tested in Grade 12 when students in the lower high school grades were tested initially. The findings indicated that the average increases in aptitude scores attributable to practice and maturation were about the same for boys and girl6 and that the correlations between initial and retest scores (stability) were about the same for boys and girls.
Research was conducted to develop an interest inventory corresponding to the interest areas in Volume I1 of the fourth edition of the Dictionary of Occupational Titles. An inventory of 307 occupational activity items was developed and administered to a sample of 1,115 individuals in a selected number of states. The results were analyzed first to determine if it were possible to develop scales measuring the current 10 interest factors in Volume I1 of the third edition of the Dictionary of Occupational Titles (1965). This approach proved to be unsuccessful. A factor analysis was conducted to identify the most important interest factors underlying the 307 items and to develop base scales corresponding to the interest factors. This approach led to identification of readily interpretable interest factors similar in meaning and occupational coverage for men and women and broad enough to include the range of occupations in the economy. These interest factors will form the basis for the new interest inventory.
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