The Workshop on Emerging Web Services Technology (WEWST06) took place in conjunction with the 4th European Conference on Web Services (ECOWS¿06) on 4th December 2006, in Zurich, Switzerland. Acting as the natural extension to the main ECOWS conference, the main goal of the WEWST workshop is serving as a forum for providing early exposure andmuchneededfeedbacktogrowandestablishoriginalandemergingideaswithin the Web Services community. The wide variety of tools, novel techniques and emergingtechnologicalsolutionspresentedinWEWSTshareone commonfeature: they advance the current Web services research in new directions by introducing new and sometimes controversial ideas into the ?eld. WEWST focuses on research contributions advancing the state of the art in Web services technologies in the following areas: Model Driven Engineering for SOA, Mobility and Services, Streaming Services and Event Driven Architectures, Dynamic Web Service Discovery and Composition, Lightweight Orchestration- gines, SLA Creation and Service Delivery, Semantic Web, Managing Change and Service Evolution, Business Driven Development, Service-Oriented Grid Comp- ing Middleware, Business Process Management for Web Services, Software and Service Engineering. WEWST covers the whole spectrum which makes it a very important part of ECOWS.