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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.
Reason hypothesizes that most accidents can be traced to one or more of four levels of failure: 1  Organisational influences, 2  Unsafe supervision, 3  Preconditions for unsafe acts, and. 4  The unsafe acts themselves.