Two educational computer simulations are described in this paper. One of the simulations is STATSIM, a series of exercises applicable to statistical instruction. The content of the other simulation is comprised of mathematical learning models. Student involvement, the interactive nature of the simulations, and terminal display of materials are features common to both simulations. The learning simulations share two content similarities: (1) the quantitative nature of the subject matter, and (2) data outcomes following parameter specification by the student. In both cases, programing for presentation is done on an IBM 1500 instructional system using A Programing Language (APL). Using the simulations of mathematical learning models, an investigation was made of the effects of learner control of instructional sequence on attitudes, instruction time, and achievement. The results were mostly inconclusive, although there was an advantage for the naive student in learner control. It is concluded, in summary, that simulation of processes and procedures in the behavioral sciences is a viable method of instruction. (MF)