The Rover 6 is a new custom-designed sports car. An analysis of the task of building the Rover 6 reveals the following list of relevant activities, their immediate predecessors, and their duration: 2
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JOB LETTER
|
DESCRIPTION
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IMMEDIATE PREDECESSOR(S)
|
NORMAL TIME (DAYS)
|
|
A
|
Start
|
-
|
0
|
|
B
|
Design
|
A
|
8
|
|
C
|
Order special accessories
|
B
|
0.1
|
|
D
|
Build frame
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B
|
1
|
|
E
|
Build doors
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B
|
1
|
|
F
|
Attach axles, wheels, gas tank
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D
|
1
|
|
G
|
Build body shell
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B
|
2
|
|
H
|
Build transmission and drivetrain
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B
|
3
|
|
I
|
Fit doors to body shell
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G, E
|
1
|
|
J
|
Build engine
|
B
|
4
|
|
K
|
Bench-test engine
|
J
|
2
|
|
L
|
Assemble chassis
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F, H, K
|
1
|
|
M
|
Road-test chassis
|
L
|
0.5
|
|
N
|
Paint body
|
I
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2
|
|
O
|
Install wiring
|
N
|
1
|
|
P
|
Install interior
|
N
|
1.5
|
|
Q
|
Accept delivery of special accessories
|
C
|
5
|
|
R
|
Mount body and accessories on chassis
|
M, O, P, Q
|
1
|
|
S
|
Road test car
|
R
|
0.5
|
|
T
|
Attach exterior trim
|
S
|
1
|
|
U
|
Finish
|
T
|
0
|
a) Draw a network diagram for the project.
b) Mark the critical path and state its length.
c) If the Rover 6 had to be completed 2 days earlier, would it help to:
i) Buy preassembled transmissions and drivetrains?
ii) Install robots to halve engine-building time?
iii) Speed delivery of special accessories by 3 days?
d) How might resources be borrowed from activities on the noncritical path to speed activities on the critical path?