The hickory company manufactures wooden desks. management schedules overtime every weekend to reduce the backlog on the most popular models. the automatic routing machine is used to cut certain types of edges on the desktops. the following orders need to be scheduled for the routing machine:
col1 order 1 2 3 4 5
col2 time since order arrived (hrs ago) 6 5 3 1 0
col3 estimated machine time (hrs) 10 3 15 9 7
col4 due date (hrs from now) 12 8 18 20 21
the due dates reflect the need for the order to be at its next operation. a) develop separate schedules by using the fcfs, edd, spt and slack (slack=due date-production date) rules. compare the schedules on the basis of average flow time, average past due hours and average early time. b) comment on the performance of the four rules relative to these measures.