This paper presents disciplines for designing actor network of Product-Service Systems by visualizing state changes in design process and indicating tasks for state transitions. While IT vendors co-design new services with their clients, sporadic requirements and constraints may leave target users and business partners unsettled in the conceptual IT service system. IT vendors design a hypothetic service system and check it continuously through ad hoc workshops. They gradually identify such actors from possible groups of people, though this design procedure is still improvisational. A set of states and tasks is described indicating what PSS designers need to do next with possible actors, instilling correct disciplines for establishing relationships between them. (C) 2015 The Authors. Published by Elsevier B.V.