the third form of CAI user the competwr as of the studeny at a computer terminal. In this form a complete lesson course is also presented to the student and the computer keeps treak of this performance and can give a summary of his performance to the teacher whenever asked for. In drill and practice branching  type of remedial programmer is also provided for those learners who are in need of such remedial teaching. The fourth application is simulation which is effective when presented in CAI through specific  input computers develop models of processes or structure. Simulated conditions are shown on the computer screen such as working.