How much a man can do:

Lets say that we have a clerk in our school or college office and he does all of it like making results of students by totaling their marks writing obtained marks in proper box of result card then filling all records like that and in the last totals marks and write them in in the total box of the result card and he does all that I mean repeats that process of processiong result cards for each result card.Can you say that the clerk never made a mistake in preparing hundreds of result cards, the answer is that you can not be sure about that because after all our clerk fellow is an human being and at any time any where errors can occur in the work done by human, infact these errors occur because of the reason that we all are humans , what I mean is that you can see that a human gets tired and he or she feels sleepy and other things like these and when something like that happens to a human then its work is exposed to errors.

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