ADV is involved in the development of the global European ATM enterprise architecture. In brief enterprise architecture consists in describing a complex system of systems through different points of views, using different available formalisms, notations and tools.

Initially in the context of OATA (Overall ATM Target Architecture) project and then in the SJU EAEA (European ATM Enterprise Architecture) a series of layers of the ATM systems are being described for different time frame.

The framework used for the EAEA is the NATO Architecture framework (NAF) and is the backbone for the definition of each of the following views:

• Program Views: consist in detailing the phasing of the SESAR programme implementation and foreseen system development.
• Operational views: describe the main operational activities of the different actors of the European ATM. The objective is to provide a description of the operation at different levels of details to allow any user, from management position to system designer, to work with the model
  
  EATM is considered a dynamic system made of processes with different granularity levels, the behaviour of each process being driven by system or human actors, triggered by defined events / actions and constrained by a set of identified parameters.
  
  Processes when activated turn inputs into outputs, these outputs being themselves inputs to other processes and so forth, thus linking them into a web or a network of processes representing a model of the system considered. SADT is an example of methodology that was applied to process modelling in the frame of the EUROCONTROL EPISODE 3 project.
• Service Views: This view defines the services relevant to the enterprise to manage the information and support the operational processes defined by the Operational View
• System views: This view describes the systems and other resources (with their interconnections) that deliver the services required to meet the business goals. It includes the technical architecture of the future ATM System.
• Object views of European ATM, in which each element of the system (an actor, a system, a procedure etc.) becomes part of an object class with defined attributes.
  
  These objects, once instantiated can interact with each other by means of use cases, sequence diagrams, scenarios or other “animation devices” used to “breathe life” into these objects. UML is an example of language that is applied to build such models;
• Logical views of European ATM in which the system is represented according to different layers, depending on the perspective of the user interested in the view. Business layer, operational layer, service layer, system layer, technical layer are typical views that can be developed to represent ATM.

ADV has notably contributed to ATM architecture modelling through the EUROCONTROL OATA programme (Overall ATM Target Architecture) and is now onboard SESAR WPB (Target Concept and Architecture Maintenance) to work on the modelling of the ConOps and associated ATM Services (SWP4.2), and on development of the logical and technical system architecture (SWP4.3).