Keynote Papers.- Rough Sets and Computing.- Rough Sets and Data Reduction.- Data Mining and Knowledge Discovery.- Granular Computing and Cognitive Computing.- Fuzzy Sets and Computing.- Rough Sets and Fuzzy Sets.- Knowledge Technology and Intelligent Systems.- Computational Intelligence and Applications.- Image Processing and Understanding.- Formal Concept Analysis.- Special Session: Decision-Theoretic Rough Sets.- Special Session: Web Mining and Web Recommender Systems.

This book constitutes the refereed proceedings of the Fourth International Conference on Rough Sets and Knowledge Technology, RSKT 2009, held in Gold Coast, Australia, in July 2009. The 85 revised full papers papers presented together with 3 keynote papers and 2 special sessions were carefully reviewed and selected from 229 submissions. The papers are organized in topical sections on rough sets and computing, rough sets and data reduction, data mining and knowledge discovery, granular computing and cognitive computing, fuzzy sets and computing, knowledge technology and intelligent systems, computational intelligence and applications, image processing and understanding, and formal concept analysis.