Critical Ratio Scheduling

It is a technique for establishing and maintaining priorities among the jobs in a factory. The critical ratio is an index and sets the relationship between when a product is required and when it can be supplied.

Critical Ratio = (Demand Time/Supply lead time)

A Critical ratio of

• Greater than one means that there is sufficient time and the job can be completed ahead of the schedule.
• Equal to one implies that the job is just on schedule and requires close watch.
• Less than one suggests that the job is critical and needs to be expedited to complete on schedule.

Advantages of Critical Ratio Scheduling

1. To fix up relative job priorities for scheduling.
2. The status of each job is determined.
3. Establishes the relative priorities among various activities on a common basis.
4. The schedule can be adjusted automatically when there are changes in job demand and progress.