Computer Aided Instruction and Computer Managed Instruction (CAI/CMI) provide training systems with a wide assortment of capabilities. These capabilities range from simply recording a student's progress to eliminating the need for a full time instructor. This paper explains the methodology used to determine the amount of CAI/CMI necessary to support the needs of the user. It also discusses the management of the interaction and coordination of the CAI/CMI design with other trainer design elements. The NTDS Laboratory Trainer - Device 20F17 is referred to as a quantitative example of managing CAI/CMI development. In the development of Device 20F17, the courseware developer's involvement allowed for the early definition of the amount of CAI/CMI needed and the degree of automation required. This timely input in the proposal phase influenced the hardware and software design to accommodate the CAI/CMI needs, thus minimizing the cost of including these features.