Companies have long sought to integrate existing Information Systems (IS) in order to support existing and potentially new business processes spread throughout their "territories" and possibly to collaborating organizations. A variety of designs can be used to this end, ranging from rigid point-to-point electronic data interchange (EDI) interactions to "Web auctions." By updating older technologies, such as "Internet-enabling" EDI-based systems, companies can make their IT systems available to internal or external customers; but the resulting systems have not proven to be flexible enough to meet business demands. A more flexible, standardized architecture is required to better support the connection of various applications and the sharing of data. Service-Oriented Architecture (SOA) is one such architecture. It unifies ("orchestrates") business processes by structuring large applications as an ad-hoc collection of smaller modules called "Services." These applications can be used by different groups of people both inside and outside the company, and new applications built from a mix of services (located in a global repository) exhibit greater agility and uniformity.Thus, SOA is a design framework for realizing rapid and low-cost system development and improving total system quality. SOA uses the Web Services standards and technologies and is rapidly becoming a standard approach for enterprise information systems integration.SOA adoption by enterprises has been identified as on