The digital transformation of an organization, and more broadly of society, consists in the evolution of its digital infrastructure with new information services and service systems supporting its progress. The most remarkable innovation comes with transdisciplinary services. Building such services requires the involvement and contribution of all relevant actors as well as an approach to lead a fruitful co-creation. Recently we have introduced an approach, called Third Place for Services (TPS), aiming to serve this purpose. TPS focuses on building a heterogeneous network of contributors and guides the co-creation of transdisciplinary information services in an exploratory way. Since then, we have conducted several experimental TPS as case studies aiming to validate the applicability of the approach and to refine its definition based on feedback from participants and our observations. In this paper, we present the current definition of the TPS method and the case studies that demonstrate its value.