Avionics devices designed to provide pilots with graphically displayed traffic information will enable pilots to acquire and verify the identity of any intruder aircraft within the general area, either before or in accordance with a controller-issued traffic advisory or alert. A preliminary evaluation was performed of an airborne capability to display traffic information (OpEval-1, July 1999). As part of that evaluation, audiotapes were analyzed of the communications between pilots flying aircraft equipped with a cockpit display of traffic information (CDTI) and terminal radar approach controllers, who provided them with air traffic services.