A dispatching rule that calculates a priority index number by dividing the time to due date remaining by the expected elapsed time to finish the job. For example,critical ratio=time remaining/work remaining=30/40 =0.75.A ratio less than 1.0 indicates the job is behind schedule, a ratio greater than 1.0 indicates the job is ahead of schedule, and a ratio of 1.0 indicates the job is on schedule.
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