Considers two aspects of design and performance evaluation of information systems: initiation, planning, development, and testing of new systems, to include modification of existing structures; and appraisals and measurement of operational systems and components. A taxonomy of information systems provides a basis for organized evaluation of system…

Describes rough sets theory and discusses the advantages it offers for information retrieval, including the implicit inclusion of Boolean logic, term weighting, ranked retrieval output, and relevance feedback. Rough set formalism is compared to Boolean, vector, and fuzzy models of information retrieval and a small scale evaluation of rough sets is…