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1. Introduction Nowadays, Internet is no longer just about e-mail and Web sites. The net has become the critical medium, powering a growing list of revenue-generating business activities from e-commerce and e-supply chain management to online marketplaces and collaboration. The sum of all these activities can acquire the term Web Services. In the beginning, the internet was mostly helping different people to communicate with each other. Web services on the other hand are useful in helping different applications to interact and communicate. In the past, a purchasing agent might send a purchase order to a supplier via email. In the age of Web Services, a company’s purchasing application communicates via the Internet directly with a supplier’s warehousing application to check price and availability, submitting the purchase order to the supplier’s shipping application automatically, with little or no human intervention. The benefits of Web Services are not limited to interactions between different companies. Business units within the same enterprise often use very different processing environments. Each domain is likely to be managed differently and under the control of different organizations. What make