Discusses how the British Post Office is using the Prestel information retrieval system. The information structure adopted for the Prestel databases and how the Prestel system hardware works are presented. Computer system software, types of information, and the impact of Prestel system on society are also presented. (HM)

The major features of Computer Managed Instruction (CMI) are diagnosis and testing, analysis, record keeping, and prescription. Diagnosis and testing are used to evaluate each student's performance at regular intervals. The results are analyzed to update the student's record and provide a prescription which suggests the learning process the…