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400 CHAPTER 9 PROJECT SCHEDULING: PERT/CPM

Develop a complete activity schedule based on the crashed activity times.

17 Consider the following project network and activity times (in days).

A C E

Start Finish

B D F G

Activity A B C D E F G
Time 3 2 5 5 6 2 2

The crashing data for this project are as follows.

Time (days) Cost (E)
Activity Normal Crash Normal Crash

A 3 2 800 1 400
B 2 1 1 200 1 900
C 5 3 2 000 2 800
D 5 3 1 500 2 300
E 6 4 1 800 2 800
F 2 1 600 1 000
G 2 1 500 1 000

a. Find the critical path and the expected project completion time.
b. What is the total project cost using the normal times?
c. What is the expected project completion time and cost with crashing?
18 Office Automation developed a proposal for introducing a new computerized office system that
will improve word processing and interoffice communications for a particular company.
Contained in the proposal is a list of activities that must be accomplished to complete the new
office system project. Use the following relevant information about the activities.
Time (weeks) Cost (E1000s)

Immediate
Activity Description Predecessor Normal Crash Normal Crash

A Plan needs — 10 8 30 70
B Order equipment A 8 6 120 150
C Install equipment B 10 7 100 160
D Set up training lab A 7 6 40 50
E Conduct training course D 10 8 50 75
F Test system C, E 3 3 60 —

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