ABSTRACT
In our present study, we introduced a functional relationship diagram showing technical and human subsystems affecting air traffic safety at ATC side, then we focused on the human operators in the system of ATC and their impact on the safety (and efficiency) of air traffic. We examined the factors that influence the workload of air traffic controllers working in the Flight Information Region (FIR) of Budapest (BUD) and analyzed how different sets of such factors can be used to predict the optimal number of controllers needed to handle a certain traffic situation.
