Service Oriented Architecture has gained a universal acceptance as a strategy for developing new applications in dynamic environments through self contained, reusable and configurable services. By adherence to the web services standards stack, these services can interoperate with other services and can also be transformed into a composition of services. The behavior and operation of a service has to be closely monitored for an efficient delivery to the client. Ranking and selection of the services among various service providers have become an important factor for a successful business solution. Quality of Service (QoS) determines the quality and usability of a service and is determined after analyzing the QoS attributes collected from various sources. Hence it has become our research motivation for transfer and reception of QoS data. In this paper, we propose an adaptive and reliable service delivery framework, which adopts a Fuzzy-Bayesian Network (FBN) approach through which the web services can be ranked and selected automatically. Also this framework offers reliability and availability aspects of QoS demand.