This report evaluates the database modeling capabilities of three large scale computer simulation facilities. The systems overviewed and contrasted are: (1) CASE, a TESDATA commercial product; (2) DIMUI, a TECHNION University research product; and (3) IPSS, an Ohio State University research product. Chapters are further provided which overview simulation techniques and the area of database management systems. Criteria are derived to form the basis for evaluation of the three subject systems. Upon consolidation into a linear objective function, the systems are rated: IPSS, DIMUI, and lastly CASE. System deficiencies are revealed and fruitful areas for further research are objectively discussed. (Author)