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FatigueFatigue is a natural process that affects all humans. Natural biological clock changes combined with exertional activity, shift work, time changes and stress are contributing factors.  Fatigue is a focal point for poor performance and errors. Fatigue reduction will decrease workplace injuries whether on the flight deck, air traffic control tower, maintenance facility or factory. Fatigue is accompanied by decreased wakefulness and vigilance. Poor judgement, apathy, indifference and mood changes can occur. Understanding fatigue status and employing countermeasures will decrease errors, injuries and accidents.