In 1946, an inspection of the ATC practices in the United States resulted in the provisional International Civil Aviation Organization (ICAO) aligning international standards with those of the United States. The main job of the air traffic controller is to prevent collisions between aircraft in the air, and when they are on the ground to prevent collisions between aircraft and obstructions. ATC instructors in Australia implemented an interesting training method to allow instructors to assess competence, which they call a "prompting hierarchy" (ATC3). An air traffic control service provider in New Zealand began working on their own internal competency model in 2001. Based upon the rich body of work that has already been discussed, it is logical to expect that the ICAO would be working on a global competency framework for air traffic controllers (ATCOs) and air traffic safety electronics personnel (ATSEP).