ISO15118 specifies the communication between Electric Vehicles (EV), including Battery Electric Vehicles and Plug-In Hybrid Electric Vehicles, and the Electric Vehicle Supply Equipment (EVSE). As the communication parts of this generic equipment are the Electric Vehicle Communication Controller (EVCC) and the Supply Equipment Communication Controller (SECC), ISO15118 describes the communication between these components. Although ISO15118 is oriented to the charging of electric road vehicles, it is open for other vehicles as well. This part of ISO15118 specifies terms and definitions, general requirements and use cases as the basis for the other parts of ISO15118 . It provides a general overview and a common understanding of aspects influencing the charge process, payment and load levelling. ISO15118 does not specify the vehicle internal communication between battery and charging equipment and the communication of the SECC to other actors and equipment (beside some dedicated message elements related to the charging). All connections beyond the SECC, and the method of message exchanging are considered to be out of the scope as specific use cases. NOTE1 Electric road vehicles specifically are vehicles in categories M (used for carriage of passengers) and N (used for carriage of goods) (compare ECE/TR ANS/WP.29/78 ev.2). This does not prevent vehicles in other categories from adopting ISO15118 as well. NOTE2 This part of ISO15118 is destined to orientate the message set of ISO15118‑2 . The absence of any particular use case in this part of ISO15118 does not imply that it shall not put into practice, with the required messages. NOTE3 This part of ISO15118 and ISO15118‑2 are designed to work independent of data transfer medium used. However, this series of documents are made for fitting the specified data link layers in the corresponding documents in this series.