Consider the job information. Each job must proceed sequentially through the different work areas, and each area can work on only one job at a time. Sequence the jobs according to the (1) first-come, first-served rule, (2) earliest due date, and (3) critical ratio. Calculate average lateness under each rule. Which rule performs best? Are any of the results completely satisfactory? What are the implications?

CRITICAL RATIO JOB A B PAINTING 1.5 4 3 6 Estimated Days ASSEMBLY 2 3 2 4 PACKING 0.5 1 0.5 1 TOTAL TASK DAYS UNTIL TIME DUE 4 15 8 16 5.5 8 11 20 D First come - first served PAINTING JOB START END ASSEMBLY START END PACKING START END DAYS LATE Average lateness: Earliest due date PAINTING JOB START END ASSEMBLY START END PACKING START END DAYS LATE Average lateness: Critical ratio PAINTING JOB START END ASSEMBLY START END PACKING START END DAYS LATE Average lateness