The increasing demand for territorial services requires the improvement of the coordination and cooperation among stakeholders in planning and delivery of integrated health and social services. In this scenario, to improve the communication among stakeholders there is a need of a formal conceptual model that facilitates the interoperability between organizations and professionals. This paper presents the methodology adopted by a UNINFO working group established in Italy to extend the ContSys standard with social care concepts to integrate health and social care contexts in a continuity of care perspective. An example of this extension is also provided considering the definition of patient’s care plans.