The description of the concept (previous step), when agreed with the users and stakeholders, must go one level down and be refined and formalized to “move from the operational side to the engineering side”.
ADV Systems defines operational and technical requirements for ATM systems and equipment, supported by information management techniques, which enable them to be expressed and organized in a way that is unequivocal, standard, clear and synthetic.
Our expertise has been notably recognised by major European bodies, such as EUROCONTROL and the European Commission, for instance to deliver the documentation relative to the operational and functional requirements for A-SMGCS levels 1 and 2.
http://www.eurocontrol.int/airports/public/standard_page/APR1_Projects_ASMGCS.html