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A 'compressed' shift schedule (substitution of a rest day by a shift, shortening the duration of work breaks) was introduced for a better fit with aircraft traffic load. Thereafter, the company asked for a survey assessing the effects of the compressed shift system. Air traffic controllers (ATCOs) completed retrospectively a specific questionnaire assessing the effects of shift schedule (modified vs. initial) and of traffic load on fatigue, alertness (on-shift, upon awakening, during daily non-work activities), and sleep (duration, satisfaction). Work organ