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of the product.

The third element of control, the comparator, determines the need for correction by comparing what is occurring with what has been planned. Some deviation from the plan is usual and expected, but when variations are beyond those considered acceptable, corrective action is required. It involves a sort of preventative action that indicates that good control is being achieved.

The fourth element of control, the activator, is the corrective action taken to return the system to its

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