The present standard, ""Project breakdown structures"", is 2 of EN 13290 Space project management - General requirements. In order to create the reference system for project management necessary for implementation of a project and ensure consistency, the project shall be broken down into a unique, orderly and exhaustive manner, to allow unambiguous identification of the associated products and models, as well as the tasks and resources necessary. This Standard defines the principles to be respected for setting up, using and adapting the breakdown structures and implementing them into a project.The requirements specified herein apply to and affect the custom