The Web is rapidly becoming the platform through which many companies deliver services to businesses and individual customers. E-Services are typically delivered point-to-point; however, the e-service environment creates the opportunity for providing value-added, integrated services, which are delivered by composing existing e-services, possibly offered by different companies. In order to enable organizations to pursue this business opportunity we are developing eFlow, a platform that supports the specification, enactment, and management of composite e-services, modeled as processes that are enacted by a service process engine. In this talk I will present the eFlow model and system, which provides a flexible, configurable, and open approach to service composition. In fact, eFlow provides an adaptive and dynamic process model, that allows processes to transparently adapt to changes in the environment, to customize service execution according to the customers' needs, and to cope wi...