ISO 21504:2015 provides guidance on the principles of project and programme portfolio management. ISO 21504:2015 is relevant to any type of organization including public or private and any size organization or sector. The guidance presented in ISO 21504:2015 is intended to be adapted to suit the specific environment of the project and programme portfolio. ISO 21504:2015 does not provide guidance on project management, programme management, or general business portfolio management (e.g. financial portfolio management).