IEC TR 62746-2:2015(EN) describes the main pillars of interoperability to assist different Technical Committees in defining their interfaces and messages covering the whole chain between a smart grid and smart home/building/industrial area. The main topics covered by this technical report are: architecture model from a logical point of view, set of user stories describing a number of situations related to energy flexibility and demand side management, set of use cases based on the user stories and architecture, details of the communication, identified in the use cases, by describing the requirements for messages and information to be exchanged.