This thesis presents the Knowledge Management Information Tool (KM-IT) Vendor Management Web Service and its reliability features. KM-IT is a web-based knowledge management information tool for the deactivation and decommissioning (D&D) user community. The Vendor Management (VM) module provides a directory service for searching D&D vendors. Clients have an increasing need to integrate and display the vendor information in their own applications. As such, this study proposes Web Services technology to provide VM access to clients. Moreover, when clients access information, particularly via mobile applications, they can encounter different failures that may occur on the network or the server. Such problems require fault tolerance in the VM Service. This study examines various reliability standards and selects the WS-ReliableMessaging standard as the best-suited approach to implement the reliability features for the VM Service. Implementation evaluation confirms that the KM-IT VM Service can effectively tolerate different types of failures.