Regular Papers.- Flow Graphs and Data Mining.- The Rough Set Exploration System.- Rough Validity, Confidence, and Coverage of Rules in Approximation Spaces.- Knowledge Extraction from Intelligent Electronic Devices.- Processing of Musical Data Employing Rough Sets and Artificial Neural Networks.- Computational Intelligence in Bioinformatics.- Rough Ethology: Towards a Biologically-Inspired Study of Collective Behavior in Intelligent Systems with Approximation Spaces.- Approximation Spaces and Information Granulation.- The Rough Set Database System: An Overview.- Rough Sets and Bayes Factor.- Formal Concept Analysis and Rough Set Theory from the Perspective of Finite Topological Approximations.- Dissertations and Monographs.- Time Complexity of Decision Trees.