Operations and Supply Chain Management The Core

162 OPERATIONS AND SUPPLY CHAIN MANAGEMENT
JOB AND DESCRIPTION
IMMEDIATE
PREDECESSORS
TIME
(HOURS)
A
B
C
D
E
F
G
H
Start
Get computer printouts of customer purchases
Get stock records for the month
Reconcile purchase printouts and stock records
Total stock records by department
Determine reorder quantities for coming period
Prepare stock reports for purchasing agents
Finish
—
A
A
B, C
B, C
E
D, F
G
0
10
20
30
20
40
20
0
17. For the network shown:
D(6)
B(10)
A(5)
E(7)
G(4)
C(8)
F(4)
a. Determine the critical path and the early completion time in weeks for the
project.
b. For the data shown, reduce the project completion time by three weeks.
Assume a linear cost per week shortened, and show, step by step, how you
arrived at your schedule.
ACTIVITY
NORMAL
TIME
NORMAL
COST
CRASH
TIME
CRASH
COST
A
B
C
D
E
F
G
5
10
8
6
7
4
4
$ 7,000
12,000
5,000
4,000
3,000
6,000
7,000
3
7
7
5
6
3
3
$13,000
18,000
7,000
5,000
6,000
7,000
9,000
18. The following CPM network has estimates of the normal time in weeks listed for
the activities:
B(2) D(5) F(4)
A(7)
G(5)
C(4)
E(2)
a. Identify the critical path.
b. What is the length of time to complete the project?
c. Which activities have slack, and how much?