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The paper presents a multi-dimensional framework for exploring the drivers, structure and dynamics of public-private service innovation networks in the smart city context and their innovation outcomes at the project, network and city levels. The framework provides a conceptual contribution to the increasingly relevant issue of open innovation in smart cities by leveraging the interpretive potential of the open service innovation perspective, namely the concept of Public Private Innovation Networks in Services (ServPPINs), to advance the understanding of complex interactive structures and processes involved in the development of new services for smart users.