Unquestionably, security awareness is an important topic in air traffic control. The ground controller support
system TraMICS includes already a security component and displays an indication regarding the current
security situation to the controller. This paper reports about a workshop performed with eight controllers. It
describes the methodology and the results of the workshop aimed to find out, how the security situations
indicator, its concept, calculation and notification could be improved. Moreover, since security situations
interrupt planned workflow, the paper investigates understanding and operational interpretation of the term
disturbance in the air traffic ground controller domain and specifies its definitio
