Vocational indecision was defined as being both a college upperclass student and having no major. In a sample of 1622 students in college for three years, 24 percent "no majors" were found and compared with majors using pre-college measures of achievement, aptitude, and interest. Measures of interest differentiation were of particular concern. No major status was best predicted from present or past ability measures, e.g., high school mathematics grades and English Usage test scores. Nonacademic predictors slightly augmented the multiple correlation including Outdoor interest, Business Contact interest, and interest differentiation. Most important to vocational indecision in these juniors and seniors, however, was lower intellectual ability. (Author)