This paper documents a project that developed a hierarchical auditory alert scheme for air traffic control consoles, replacing a basic system of auditory alerts. Alerts are designed to convey the level of urgency, not provoke annoyance, be easily distinguished, minimize speech interference, and be easily localized. User evaluations indicate that the new alert scheme is highly advantageous, especially when combined with improved visual coding of alerts. The alert scheme was implemented in Australian air traffic control centers in July 2005.
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