Dolphin is a computer-assisted instruction system used to teach and reinforce skills in reading, language arts, and mathematics. An evaluation of this system was conducted to provide information to TSC Division of Houghton Mifflin regarding its effectiveness and possible modifications to the system. The general design of the evaluation was to compare Dolphin and non-Dolphin schools on a comprehensive set of Chapter 1 program effectiveness measures, including the achievement gains of Dolphin and non-Dolphin schools using school year (SY) 1982-83 standardized test results as the pretest and SY 1984-85 results as the posttest. Study participants included Chapter 1 teachers and students in grades 4, 5, and 6, as well as principals, regular classroom teachers from grades 4, 5, and 6, and instructional aides in Chapter 1 schools. Questionnaires were developed for each group. Items for the adult populations were designed to provide data for comparing Dolphin and non-Dolphin schools and their Chapter 1 programs, and participants' opinions on Dolphin features and implementation. The student questionnaires were designed to provide attitudinal measures for comparison between Dolphin and non-Dolphin students. Results indicate that the Dolphin schools rated higher than the non-Dolphin schools on all criteria from the questionnaires, the test scores, the student records, and classroom observations. In addition, the presence of Dolphin is related to measures of areas that educators traditionally consider important to the learning process, i.e., student attitudes toward school and continuing education; teacher attitudes toward students; and student, teacher, and principal beliefs that learning is occurring. Appendices include the data collection instruments, a discussion of the statistical analysis methods used, and participant responses to open-ended questions. (JB)