Growing business complexities and information needs have prompted extensive use of complex software applications in almost every organizational function. These complex applications, from payroll to supply chain integration and customer relationship management, and running on heterogeneous technology infrastructure have exhausted the limits of traditional software architecture. Further, a shift in business orientation, i.e., from product to service calls for a better alignment of application architecture to the portfolio of services in order to maximize the utility of technology infrastructure. Service Oriented Architecture (SOA) has emerged as the most promising solution to serve this purpose.