— To reduce frequent changes and upgrades of management systems, we need a guideline of OSS's architecture and development methods of the OSSs. TMF has proposed NGOSS technology-neutral architecture (TNA) which describes major concepts and architectural details of the NGOSS architecture in a technologically neutral manner. The NGOSS TNA can be mapped onto appropriate technology-specific architectures (TSAs) using specific technologies such as XML, Java and CORBA. Web services, which is a distributed and services-oriented computing technology, can be applied to NGOSS TSA. In this paper, we examine the architectural requirements of TNA, and provide a design of Web servicesbased TSA in accordance with the TNA requirements. Keywords; NGOSS, TNA, TSA, Web services, WSDL, SOAP, UDDI, WS-BEPL