Designing new models requires the educators to observe the educational settings in which computer assisted instruction (CAI) was implemented successfully. This paper proposes a CAI model for middle and high schools in Turkey based on the observations and interviews in K-12 schools in Arizona, USA in which computer technologies are implemented successfully. The model consists of three major components, which include: (1) CAI in the one-computer classroom, (2) CAI in the multiple-computer classroom, and (3) CAI in separate computer laboratories. Each component is subdivided into two components: needs of the teacher and needs of the students. The present model provides an initial listing of suggested knowledge bases and skills that appear to be minimums for teachers and students at basic, intermediate, and advanced levels of knowledge and skills. By providing flexibility in the area of teacher and student needs, the model serves as a framework to guide decision making at the national level in Turkey. Appendices include: (A) list of schools in which CAI applications were observed; (B) observation form; (C) list of the interviewees; (D) interview questions answered by directors of academic services information systems & technology offices in the school districts; (E) interview questions answered by the school principals and/or computer coordinators; (F) interview questions answered by teachers and/or media specialists; (G) a sample of observation record; and (H) samples of structured interviews. (AEF)