An experiment in an introductory psychology course investigated whether gains in final exam performance, similar to those reported in the personalized system of instruction (PSI) literature, could be obtained by substituting a computer for human proctors. The course was divided into two sections, with a sample of 17 students in section 1 matched in precourse knowledge with 17 students in section 2. Student subjects in both sections used an introductory psychology text accompanied by a behavioral objectives study guide. Students in section 1 took quizzes at computer terminals, while section 2 students took manual quizzes. Although students in section 1 were allowed to work at their own pace, they had to have no less than eight of the ten questions correct on each unit quiz before proceeding to the next unit; students in section 2 had to proceed to the next unit regardless of the score obtained on a given quiz. All subjects received immediate feedback on the quizzes. Students using the computer performed significantly better than those in the other section on the final exam. On an attitude questionnaire given to all student subjects, students in the computer managed instruction (CMI) section, felt they had attained a better understanding of basic concepts and principles and gave their section an overall higher rating than the traditional group. CMI students also found the process of taking quizzes at a computer terminal "pleasant." (CMV)