This International Standard contains a detailed description of the (actor invariant) Roles and Responsibilities required to deploy and operate Cooperative-ITS (C-ITS). The organization / organization of actors / roles described in this document are designed to be appropriate for any fully operational system that uses the C-ITS concepts and techniques in order to achieve its service provision. This International Standard is presented in terms of an Organizational or Enterprise Viewpoint as defined in ISO/IEC 10746 Open Distributed Processing. This International Standard, Roles and Responsibilities in the context of Cooperative-ITS based on architecture(s) for cooperative systems is for all types of road traffic of all classes, and for any other actors involved in the provision of applications and services which use C-ITS (3.8) techniques to achieve service provision. The description of roles is technology agnostic and, in terms of Cooperative-ITS, agnostic in respect of communication modes and embraces vehicle-vehicle communications, vehicleinfrastructure communications and infrastructure-infrastructure communications. This International Standard provides a methodology for the identification of service specific roles and their corresponding responsibilities based on a process oriented approach. Additionally, the methodology is used to identify the roles and responsibilities for Cooperative-ITS (3.8) in general. Both the methodology as well as the roles and responsibilities for Cooperative-ITS are deduced from ISO/IEC 10746, the reference model of Open Distributed Processing . Open Distributed Processing offers five viewpoints of which the Enterprise Viewpoint (3.10) corresponds with the Organizational Architecture and its roles and responsibilities. To limit the scope of the document to the core of Cooperative-ITS, the roles are separated into external and internal . Considered to be internal are all roles that are highly relevant for the purpose of achieving service provision by means of Cooperative-ITS. Considered to be external are all roles involved in Cooperative-ITS, but not set up only for the purpose of Cooperative-ITS. This International Standard provides a description of a high-level architectural viewpoint on Cooperative-ITS. It is designed to be used as a blueprint when implementing service provision systems that use Cooperative-ITS, and the corresponding organizational structures. The characteristics of Cooperative-ITS entail a huge number of data / information exchanges therefore the implementation stringently needs to respect privacy and data protection as it is defined in ISO/TR 12859 and in national laws and regulations (where instantiated). Privacy and data protection affects all roles defined in this International Standard due to these characteristics and all actors occupying roles in Cooperative-ITS need to respect the corresponding standards and regulations.