Feature Selection with Rough Sets for Web Page Classification.- On Learning Similarity Relations in Fuzzy Case-Based Reasoning.- Incremental versus Non-incremental Rule Induction for Multicriteria Classification.- Three Strategies to Rule Induction from Data with Numerical Attributes.- Fuzzy Transforms.- Possible Equivalence Relations and Their Application to Hypothesis Generation in Non-deterministic Information Systems.- Applications of Fuzzy Logic Functions to Knowledge Discovery in Databases.- Fuzzy Integral Based Fuzzy Switching Functions.- First Steps towards Computably-Infinite Information Systems.- Data Structure and Operations for Fuzzy Multisets.- A Non-controversial Definition of Fuzzy Sets.- Algebraic Structures for Rough Sets.- Rough Mereology as a Link between Rough and Fuzzy Set Theories. A Survey.- Fuzzy Rough Sets Based on Residuated Lattices.- Semantics of Fuzzy Sets in Rough Set Theory.- A New Proposal for Fuzzy Rough Approximations and Gradual Decision Rule Representation.- Emergent Rough Set Data Analysis.