Today''s information systems need to meet the challenges of increased regulation, clients'' demand of customized products and services, and the accelerating speed at which business is conducted. Companies must manage thousands of business rules represented in software code, in database, in spreadsheets, and in paper-based policy manuals. A business process rules engine (BPRE) enables an organization to increase its agility and speed to adapt to business process changes, while increases rule transparency, flexibility, and accuracy of processing. The contribution of this book is the design, implementation, and evaluation of a novel BPRE that overcomes many of the implementation, validation, and maintenance problems associated with large monolithic rule repositories. The design adopts a database approach and an innovative and efficient database rule match algorithm. The evaluation of the BPRE artifact comes from user surveys that help uncover the business values and the issues relating to user acceptance of a business process rules engine. The design has been successfully implemented in a large financial services organization.