CPSoS is a 30-month Support Action that will provide an exchange platform for Systems of Systems (SoS) related projects and communities. It will focus on the challenges posed by the engineering and the operation of technical systems in which computing and communication systems interact with large complex physical systems. Its approach will be simultaneously integrative, aiming at bringing together knowledge from different SoS related communities and applications driven.It will bridge between the different approaches to the design, analysis and control of systems of systems that are pursued by different communities in theory and applications and relate the methods and tools proposed for dealing with SoS to key application domains which are important for Europe's competiveness as well as for the well-being of its citizens. The project will examine in depth application-specific issues, capture cross-industry and cross-application findings and propose new avenues for SoS analysis, design and control, towards a science of systems of systems and a European R&I agenda on SoS, involving different scientific communities, application domain experts, end-users and vendors.Three Working Groups will be created: on SoS in Transportation and Logistics, Physically connected SoS, and Tools for SoS Engineering and Management. Public events will be organised in conjunction with the Working Group meetings, floor will be given to SoS-related projects to expose their outcomes. The contributions will be summarized in a concise strategic policy document "European Research and Innovation Agenda on Cyber-physical Systems of Systems", supported by a set of in-depth technical papers, and presented at a symposium "Cyber-physical Systems of Systems Meeting Societal Challenges". The project will prepare the EU stakeholders for extracting a competitive advantage from the recent and the future developments in the area of SoS.