AbstractMultiple-model OR packages (MMORPs) are software packages which incorporate algorithms for the solution of a wide range of OR models. In this paper we consider 15 such packages which are currently available for the IBM-PC. A detailed review of these packages with respect to six common OR models [linear programming, integer programming, assignment, transportation, network analysis (PERT/CPM) and Markov processes] is presented. Criteria for choosing a MMORP are highlighted and a subjective judgement made as to whether each package is worth considering for purchase or not.