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The following human factors are common causes of accidents: 1  Memory - Memory lapse may occur at any time. 2  Judgment and reasoning power - May be reduced due to many factors. 3  Attention - Failure to remain attentive or lack of attention.
A factor is considered a root cause if removal thereof from the problem-fault-sequence prevents the final undesirable event from recurring; whereas a causal factor is one that affects an event's outcome, but is not a root cause.