Consider the construction of a research building for Eli Lilly & Co., a pharmaceutical company, a few years ago. This 550,000 ft2, 4-story (in 3 wings), $135 million building was planned to be completed in five years. It required special ventilation for 162 labs, purified water, and special drainage. Consider the following list of major activities/work packages (as seen by Eli Lilly), their expected duration, and their relationship to other activities/work packages for the Eli Lilly building.

a. Draw the precedence network.
b. Determine the ES, EF, LF, and LS times.
c. What is the project duration?
d. What are the critical activities?

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Duration in months Pedecessor 0 Immediate Activit A. project approval 8. docido gonoral roquiromonts C.choose A/E firm D. preliminary design E. choose project management firm F. decide detailed requirements G finalize design H. schedule, budget, manual L. start bid packages J. excavate, foundation, steel structure K. put up enclosures L. HVAC, fire protection, plumbing M. Electrical N. Interior finishes O.close out project B, C D, E G, H 12 K,L,M