The activity times shown in Figure 7.35 are based on Bill’s estimates of total labor hours per activity and an 8-hour work day. For example, Bill estimated that Frame-in will require 40 labor hours; given an 8-hour day, he came up with 5 days. Thus, all the times in Figure 7.35 assume that subcontractors assign a “crew” of one worker to each activity. According to these time estimates, it should take 54 days to complete each floor. His boss, Naomi Watts, says that 54 days per floor is too long and that to complete the project on time, each floor should take no more than 35 days.

Looking at the seven activities per floor, Bill sees that 35 days per floor could be achieved if each activity took no more than 5 days. He intends to point this out to his subcontractors.

a. Bill’s estimates assume one worker per activity. How many workers (what crew size)
should the contractors assign to each activity such that it will take at most 5 days?

b. Given the increased crew sizes, how long will it take to complete the project? Assume that a computed fractional day’s duration is always rounded up.

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