Due to the popularity of knowledge discovery and data mining, in practice as well as among academic and corporate R&D professio- nals, association rule mining is receiving increasing attention. The authors present the recent progress achieved in mining quan- titative association rules, causal rules, exceptional rules, ne- gative association rules, association rules in multi-databases, and association rules in small databases. This book is written for researchers, professionals, and students working in the fields of data mining, data analysis, machine learning, knowled- ge discovery in databases, and anyone who is interested in asso- ciation rule mining.