Instruments used in a study by M. B. Kinzie and M. A. Delacourt (1991), the Attitude towards Computer Technologies (ACT) and the Self-efficacy for Computer Technologies (SCT), assess preservice teachers' perceived usefulness of and comfort level with specific computer technologies. This study uses a population confirmed to be similar to that used by Kinzie and Delacourt and a similar two-pronged approach to study the evaluation of teacher education programs that are implementing specific computer literacy content. Data were obtained from students across courses and over three semesters in a representative teacher education program in a small private liberal arts college. In all, 58 students were assessed using a single computerized instrument, the Computer Confidence/Self-efficacy Scale that combines features of both previous instruments. Data reveal that the Computer Confidence/Self-efficacy Scale is a highly reliable instrument for measuring the levels of confidence of preservice teachers under the conditions of a teacher education program. The instrument must be interpreted under the assumptions of a construct of computer confidence that consists of general computer confidence and efficacy and specific computer competence and efficacy as identified in the course focus. Appendixes present the scale itself, significant group differences by selected group variables, and bar graphs of the mean scores for specific categories. (Contains 14 tables, 5 appendix tables, 6 appendix figures, and 25 references.) (SLD)