Three models are examined in terms of their historical growth, structural similarities and differences, and their implementation and use. They are CAMPUS (Comprehensive Analytical Methods of Planning in University Systems), RRPM (Resource Requirements Prediction Model), and HIS (Hochschule Information System). Their basic logics are explained with respect to level of detail and planning variables. Student flow modules, non-salary costs, and general costing are considered. Differences are cited among dimensions, revenue model, capital budget, output reports, capacity module, and development and implementation costs. Other planning modules are mentioned: CAP:SC/SEARCH, HELP/PLANTRAN, and TUSS. From the viewpoint of helping the user implement and use the model, none of the models provide help in formulating the support (non-salary) cost equations nor in calculating the cost coeffecients. The models also do not help the use to calculate trade-offs directly. (LBH)