An elegant way to make cities smarter would be to design a platform where every citizen is given an opportunity to be effectively connected to the governing bodies in their location and to contribute to the general well being. In this paper, we present CrowdSC, an effective crowdsourcing framework designed for smarter cities. We show that it is possible to combine data collection, data selection and data assessment crowdsourcing activities in a crowdsourcing process to achieve sophisticated goals in a predefined context. We propose different strategies for managing this process. We also present an experimental study that evaluate outcomes of the process depending on these execution strategies.