Discovery Science : 7th International Conference DS 2004 Padova Italy October 2 5 2004. Proceedings This book constitutes the refereed proceedings of the 7th International Conference on Discovery Science DS 2004 held in Padova Italy in October 2004. The 20 revised long papers and the 19 revised regular papers presented were carefully reviewed and selected from 80 submissions. The papers are organized in topical sections on pattern mining classification outlier detection clustering feature construction and generation knowledge acquisition discovery science in reality machine learning algorithms Web mining applications of predictive methods and interdisciplinary approaches