One category, which we will refer to as micro-model management, is concerned with assisting users through a single modeling technique from the formulation of a problem through interpretation of a solution. A sophisticated linear programming package or advanced spreadsheet might be considered an MMS in this domain. The other category, which we will call macro-model management, directs its attention to selecting an appropriate modeling technique or structure from among the wide variety of modeling techniques available. Most MMS in the literature use a formalism that is restrictive with respect to the mechanics of the model selection function. Enhancements to theory enable researchers to mitigate some of the rigidity.
Objects can assume many properties including possibilities, values, or distributions.
Several fuzzy tools exist that could be incorporated into different model management structures. Belief functions are used in this exploration to build a simple prototype. The problem domain is integer programming. The model methodologies include several general integer programming optimization algorithms. The selection criteria contain characteristics of integer programs.