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# PERT, Critical Path

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Pleas see the attached case study table and questions to be answered.

1. Develop a network drawing for Hill Construction and determine the critical path. How long is the project expected to take?
2. What is the probability of finish in 270 days.

3. If it is neccesay to crash to 250 or 240 days, how would Hill do so, and at what costs? As noted in the case, assume that optimistic time estimate can be used as crash times

SOUTHWESTERN UNIVERSITY PROJECT

The Estimates (Days)

Activity Description Preccessor(s) Optimistic Most Likely Pessimistic Crash (cost/day)
A. Bonding, insurance, tax structuring ......... 20 30 40 1,500
B. Foundation, concrete footings for boxes A 20 65 80 3,500
D. Upgrading walkways, stairwells, elevators C 30 50 100 1,900
E. Interior wiring, lathes B 25 50 35 9,500
F. Inspection approvals E 0.1 0.1 0.1 0
G. Plumbing D, E 25 30 35 2,500
H. Painting G 10 20 30 2,000
I. Hardware/AC/metal workings H 20 25 60 2,000
J. Tile/carpeting/windows H 8 10 12 6,000
K. Inspection J 0.1 0.1 0.1 0
L. Final detail work/cleanup I, K 20 25 60 4,500