In recent years there has been much eﬀort dedicated to developing approaches for service selection based on non-functional properties. It is clear that much progress has been made, and by considering the individual approaches there is some overlap in functionality, but obviously also some divergence. In this paper we contribute a classiﬁcation of approaches, that is, we deﬁne a number of criteria which allow to differentiate approaches. We use this classiﬁcation to provide a comparison of existing approaches and in that sense provide a survey of the state of the art of the ﬁeld. Finally we make some suggestions as to where the research in this area might be heading and which new challenges need to be addressed
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