In the training of maintenance and operations technicians, three enhancements to a basic, straightforward, fixed-sequence simulation system can be useful. The primary advantage of the resultant system is that the principal object of simulation is the task to be performed, which includes both the planning knowledge and the equipment actions required in task performance. The first enhancement facilitates the development, refinement, modification, and use of a hierarchical task analysis of the job; the second enables the system to adapt its presentation strategy on an individualized basis; and the third provides a means of integrating the conceptual and procedural knowledge related to the performance of the job being simulated. These enhancements use graphics and images as the representation medium for the simulation. When computer assisted instruction (CAI) simulation is coupled with such graphics display as that available with high resolution color graphics terminals, videodisc images, and/or computer-modified videodisc images, the resultant graphics simulations provide a high degree of both physical and psychological fidelity. This graphics simulation is a powerful tool for equipment-oriented operation and maintenance training. (Author/LMM)