Reflecting an emerging area, this book presents an IT system architecture approach that centers on business processes: process-centric architecture. It provides a step-by-step presentation of process-centric architecture, that includes its principles of analysis and design. This text covers the evolution of IT systems in enterprises, the importance of a business process focus, the role of workflows, business process modeling languages such as BPML and WS-BPEL, enterprise application integration, and more. The author then demonstrates how to architect and design an enterprise application based on process-centric architecture using case studies as well as illustrative examples.