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.