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Service based applications are constructed to be easily adaptable to changing environments. This adaptation was primarily investigated with respect to monitoring events, e. g., a service based application is adapted when the execution of a service fails. In this paper we focus on the adaptation of service based applications due to newly available service. In this respect we discuss whether a service of the service based application should be replaced by a service, which becomes available. From the requirements engineering perspective we argue that a service based application may be adapted when the new services contribute better to the goals of the service based application. In addition, we show that it may also be valuable to adapt a service based application when newly available services provide more functionality than the ones previously used. Both analyses are based on model comparison techniques with Tropos goal models and Tropos' reasoning techniques.