The potential usefulness of self-assessment of low-level aptitudes, such as basic or elementary reading, writing, and calculating, was explored in a test validation context, following the model of B. Davey (1980, 1990). Self-assessments were sought to provide criterion-related or construct validities that might otherwise be unobtainable for some multiple-hurdles civil service examinations. Self-assessment ratings were completed by 530 male and female, Black (49%), White (8%), and Hispanic (40%) candidates for the job of school bus driver in a large school district. Candidates evaluated themselves in the following areas: (1) high school grades in mathematics, English, and science courses; (2) ability to use logic, read and understand written materials, and perform basic mathematics; and (3) willingness to admit shortcomings and confidence in one's abilities. Candidates also took the 45-item multiple-choice Bus Driver Trainee Aptitude Test. A skewed five-point Likert type rating scale was constructed and administered to the subjects. Comparison of the self-ratings and the examination scores support the hypothesis proposed by Davey that self-assessment can be a useful tool for test validation. Seven tables present information about the candidates. A 21-item list of references and an appendix containing the Likert-type survey form completed by candidates are included. (SLD)