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396 CHAPTER 9 PROJECT SCHEDULING: PERT/CPM

Activity Description Immediate Predecessor Time (weeks)
A Survey building site — 6
B Develop initial design — 8
C Obtain board approval A, B 12
D Select architect C 4
E Establish budget C 6
F Finalize design D, E 15
G Obtain financing E 12
H Hire contractor F, G 8

a. Draw a project network.
b. Identify the critical path.
c. Develop the activity schedule for the project.
d. Does it appear reasonable that construction of the athletic complex could begin one
year after the decision to begin the project with the site survey and initial design plans?
What is the expected completion time for the project?
9 Hamilton County Parksisplanningtodevelop a new park and recreational area. Project
development activities include clearing playground and picnic areas, constructing roads,
constructing a shelter house, purchasing picnic equipment and so on. The following network and
activity times (in weeks) are being used in the planning, scheduling and controlling of this project.

C H
A

D F Finish
Start

B E G

Activity A B C D E F G H I

Time 9 6 6 3 0 3 2 6 3

a. What is the critical path for this network?
b. Show the activity schedule for this project.
c. The park commissioner would like to open the park to the public within six months from
the time the work on the project is started. Does this opening date appear to be
feasible? Explain.
10 The following estimates of activity times (in days) are available for a small project.

Activity Optimistic Most Probable Pessimistic
A 4 5.0 6
B 8 9.0 10
C 7 7.5 11
D 7 9.0 10
E 6 7.0 9
F 5 6.0 7

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