The critical ratio (cr) will be less than one if the amount of work left is larger than the amount of time left.
The crucial ratio is a guideline used in a work centre to prioritise tasks that need to be processed (CR). The CR priority index number is calculated by dividing the remaining shop time by the formula (due date - today's date). The work with the lowest CR is scheduled first when sequencing based on these factors. A dispatching rule that divides the time left before the due date by the anticipated amount of time needed to complete the task to arrive at a priority index number. Ratios below 1.0 are typically considered to be behind schedule, whereas ratios above 1.0 are considered to be ahead of plan. Critical ratio (CR) = CPI x SPI
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