About Global Priority Settings: Due Date vs. Critical Ratio
You must set priorities before running APS Planning or the Scheduler. The system plans and schedules jobs and loads them into the resource groups in order of priority.
The differences between Due Date and Critical Ratio options are discussed below.
Due Date
The system simply sets each job's priority to the number of days until the job is due + 1000. A job due 3 days from now would therefore have a higher priority (1003) than one due 6 days from now (1006).
Critical Ratio
The system assigns a priority to jobs based on the amount of work yet to be done on the job in relationship to the number of days until the job is due. The basic calculations used are:
- If job not past due: (critical ratio *100) + 1000
- If job past due: (days remaining until due date - days of process time remaining / average work hours per day) + 1000