Solved Problem 3

  1. Revisit Example 10.3, where the consulting company has five jobs in its backlog. Create a schedule using the EDD rule, calculating the average days past due and flow time. In this case, does EDD outperform the FCFS rule?

Solution

  1. Customer Sequence

    Start Time (days)

    Processing Time (days)

    Finish Time (days)

    Due Date

    Days Past Due

    Days Ago Since Order Arrived

    Flow Time (days)

    B

      0

    +

    16

    =

    16

    27

     0

    12

    28

    A

    16

    +

    25

    =

    41

    29

    12

    15

    56

    D

    41

    +

    10

    =

    51

    48

     3

    10

    61

    C

    51

    +

    14

    =

    65

    68

     0

     5

    70

    E

    65

    +

    12

    =

    77

    80

     0

     0

    77

    The days past due and average flow time performance measures for the EDD schedule are

    Average days past due= 0+12+3+0+0 5 =3.0 days

    Average flow time= 28+56+61+70+77 5

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