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CONSIDERING TIME–COST TRADE-OFFS 399

A D

I

C
Start
G
Finish
B E
H

F J

The activity time estimates (in weeks) are:

Activity Optimistic Most Probable Pessimistic
A 3.0 4.0 5.0
B 3.0 3.5 7.0
C 4.0 5.0 6.0
D 2.0 3.0 4.0
E 6.0 10.0 14.0
F 7.5 8.5 12.5
G 4.5 6.0 7.5
H 5.0 6.0 13.0
I 2.0 2.5 6.0
J 4.0 5.0 6.0

a. Develop an activity schedule for this project and identify the critical path activities.
b. What is the probability that the project will be completed so that Landon Corporation
may introduce the new product within 25 weeks? Within 30 weeks?
16 Return to the computer installation project in Problem 7 and assume that the project has to
be completed in 16 weeks. Crashing of the project is necessary. Use the following relevant
information.

Time (weeks) Cost (E)
Activity Normal Crash Normal Crash
A 3 1 900 1 700
B 6 3 2 000 4 000
C 2 1 500 1 000
D 5 3 1 800 2 400
E 4 3 1 500 1 850
F 3 1 3 000 3 900
G 9 4 8 000 9 800
H 3 2 1 000 2 000

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