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[1] It should be noted that FACTS is not designed to be used, nor should be used, in the litigation of accidents and incidents where fatigue impairment is alleged by a party to the action. CIRCADIAN does not represent or warrant that the calculated overall probability of fatigue impairment derived by FACTS rises to the level of a reasonable degree of scientific or medical certainty required by a court of law, since it is not designed to consider all the relevant evidence that may be available in a litigated case. FACTS is specifically designed for statistical assessments of fatigue impairment in a population of people or employees involved in incidents, accidents or other events. As such it can serve as a useful tool in data-driven Fatigue Risk Management Systems.