further suppose that the tatal number of instances in which some work station goes out of its control limits and produces defects is expected to be 1,000 during the coming year. in half of such instance the out-of-control condition is expected to be discovcred immediately by the operator at the faulty work station. in the other half of these instances a defect will enter 10% of the units produced the defective units enter wip between stations where they are discovered by the next station's operator and every out-of-control conditains is corrected as soon as it is discovered.