Division 7 In implementing the work programme, the Commission and the Member States will need to carefully manage complexity in terms of dependencies, variables and assumptions. The principles set out in the MASP-C will be used to manage the planning.

The projects will be rolled out in different phases, from preparation and development to construction, testing, migration and final operation. The role of the Commission and the Member States in these different phases will depend on the nature and architecture of the system and its components or services, as described in the detailed project fiches of the MASP-C. Where appropriate, common technical specifications will be defined by the Commission in close cooperation with, and subject to review by, the Member States, with a view to finalising them 24 months before the target date of deployment of the electronic system.

The Member States and the Commission should also ensure that the economic operators have received in a timely manner the technical information needed for them to update their own electronic systems and to connect to the new or upgraded electronic systems provided for in Regulation (EU) No 952/2013. Any changes need to be communicated to the economic operators between 12 and 24 months before deployment of a particular system, if necessary due to the scope and nature of the change, to allow the economic operators to plan and adjust their systems and interfaces. For minor changes, that period may be shorter.

The Member States and, where appropriate, the Commission will engage in the development and deployment of the systems in line with the defined systems’ architecture and specifications. The activities will be carried out in compliance with the milestones and dates stated in the work programme. The Commission and the Member States will also collaborate with economic operators and other stakeholders.

The economic operators will have to take the steps necessary to enable them to make use of the systems once in place, and no later than the end dates defined in this work programme or, where applicable, defined by the Member States as part of their national plans.