Evan Schwartz has 6 jobs waiting to be processed through his machine. Processing time (in days) and due date information for each job are as follows:
a 2 3
b 1 2
c 4 12
d 3 4
e 4 8
f 5 10
Sequence the jobs by FCFS, SPT, SLACK, and DDATE. Calculate the mean flow time and mean tardiness of the six hobs under each sequencing rule. Which rule would you recommend?