A reference model for crowdsourcing as a service

Online and mobile crowdsourcing services call for thorough definition of components and attributes. As cloud-based services have become widely adopted, a cloudified reference model has been emergent for crowdsourcing platforms and applications. This paper, introduces for the first time a cloudified four-phase reference model for crowdsourcing along with a generic workflow for crowdsourcing development utilizing the facilities offered by cloud service providers. Moreover, useful insights are presented for the evolution of today´s online crowdsourcing applications and platforms towards the concept of crowdsourcing as a service.