NFRs based web services scoring as web service

Non functional requirements are very interesting specially in case of business relationships. In fact they are idioms of communication between business environment parties: provider and consumer. In particular in web services context, these requirements and non functional characteristics are also seen as a ranking and selection criteria. Thus, many researchers propose tools to measure the quality of service value of web services and define scoring formulas to rank them. However, we strongly deem that a web service has relative scores depending on end-user requirements rather than an absolute score. In this research paper, we propose a mean for the client to specify his non functional constraints. These, as well as quality attributes measurements will present inputs of a newly developed scoring web service. This web service computes the score of a web service in request relatively to the client's non functional specifications. In addition, a two level ranking is provided to help the client make the suitable decision especially in case of equal scores.