This evaluation of the use of computers in the Portland Public Schools (Oregon) is divided into three main sections. (1) Computer based instruction (Chapter 1, Computer Assisted Instruction, and Chapter 2, Prescription Learning) evaluates two different systems which use computers as an aid to basic skills instruction in mathematics, reading and language usage. (2) Chapter 3, Computer Literacy Programs, evaluates instructional programs concerning computers and their use in society. (3) Chapter 4, Computer Management, evaluates the use of the computer for maintaining an on-line student information system in local high schools. The appendices include descriptions of computer use and computer-based instructional program software; curriculum match between computer-based instructional programs and the Portland Achievement Levels Tests; and tables presenting standard deviations, growth and rate of growth for participants by grade level and software, by school and grade level; and the effects of prescription learning programs by school. (PN)