25 postgraduate students (native French speakers) were given an overall briefing on Air traffic control, followed by individual familiarisation with the keyboard system and 20 training examples. They were then presented with traffic corresponding to an entry rate of 250+ aircraft per hour in random direct flight for one-hour nominal duration. (When no action was required, the simulation rate was accelerated by a factor of six, so that the average length of one exercise was about 24 minutes.) 19 students controlled this traffic correctly, with no unresolved conflicts. The total of potential conflicts was 1322 of which 1304 (98.6%) were solved correctly.
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