Table 2 As shown in the above analysis, neither of the existing methods of cloud service composition is based on the possibility theory, which is very powerful to represent partial or incomplete knowledge [34]. There are new challenges raised by service composition in cloud [32] which are caused by the diversity of users across different geographical locations with all their different legal constraints. An evaluation of techniques for service composition in the cloud is presented below in Table II. Table 2. Summary of Cloud Service Composition.