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On developing an expert system : a knowledge base for GP formulation and analysis
An expert system approach to help OR naive users formulate and
solve goal programs is proposed. The approach is demonstrated
for single product blending problems using VP-Expert as the
developmental tool. Results of a study using undergraduate and
graduate business students to test the expert system
effectiveness are provided.
An expert system determines the problem type using a taxonomy
based upon problem context. Each problem type possesses
distinct characteristics. Characteristics of twenty-four
different problem types are discussed.
Formulation of constraints using problem characteristics is
demonstrated. The expert system uses constraint information to
assist users in goal selection. Goal structures are
constructed using a pairwise comparison technique.
Solution values, recommendations based upon sensitivity
analysis, and trade-offs between conflicting goals are
provided to the user. A feedback loop permitting model changes
and reiteration of solution and recommendation steps is