Each system is specifically designed to achieve certain goals, and an important component of systems is regular evaluation processes to determine to what extent these goals are achieved. Air traffic systems are not an exception for the application of such evaluation processes. In fact, there is a great demand in this field for effective and efficient processes of evaluation. This study presents an evaluation method developed by considering the needs or demands of the international civil aviation sector and air traffic systems. This development process includes the initial determination of the areas for evaluation and the designing of various figures of merit for both fields accordingly. This model was applied to the air traffic systems of 16 EUROCONTROL member countries and important results were obtained. © TÜBİTAK.