In this paper, we are motivated by the problem of semantic web services composition. We first present a typical example requiring services composition, give a definition of an automated services composition approach and outline its main requirements. We then discuss existing techniques and their limitations with regards to those requirements. Finally, we present our proposal for web services composition based on autonomous services interactions. Key words: Semantic Web Services, Composition Approaches, Interaction between Web Services, Ontologies and Context for Web Services.