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A novel concept to support air traffic controllers, the mobile horizontal radar display filter WHEELIE allows controllers to quickly select and change the requested flight level by scrolling an Operational Display System (ODS) mouse wheel. Aircraft on the selected flight level are graphically highlighted without masking other traffic. An experimental simulation study of human factors was conducted initially to investigate WHEELIE. A multi-method approach revealed reduced perceived mental workload as a consequence of using WHEELIE. The controllers who assessed WHEELIE pointed out the positive effects of the rapid perception of conflicts as well as the better overview of the respective flight level. [ABSTRACT FROM AUTHOR]