Over the last few years, Web services technologies offered a new and successful way for interoperabilityamong web applications. A Web service is a software system designed in a way that othersoftware components and humans can discover and invoke to satisfy different needs. The vision ofWS as a software component allows to combine several WS, providing a global value-added WS,called composite WS.Although there are several researches in web services composition, more effort should be focusedon its personalization, particularly regarding how well the composition results correspond to whatthe user really wants. Accordingly, we present in this paper an approach that may contribute tothe personalization of web services composition specification. Our approach is a context-basedproposal that makes services composition specification more efficient by taking into account bothuser context, needs, and preferences and web services context, and by integrating them to thecomposition process. In addition, to permit the reuse of specifications, we enhance BPEL bydeveloping a specification language based on context to be used in composition that we calledC-BPEL.