This document discusses using data mining techniques to visualize association rules in customer relationship management (CRM) systems. It begins with an introduction to data mining and association rule mining. It then discusses challenges with existing visualization methods for large sets of association rules. The paper proposes a grouped matrix-based visualization approach that organizes rules into nested hierarchical groups to aid exploration of large rule sets. This approach aggregates rows and columns of a rule matrix to represent groups. It also uses coloring and positioning to guide the user to interesting groups and rules. The paper concludes the proposed approach addresses limitations of existing methods for visualizing large association rule sets.