Space Module Assembly. An aerospace company has received a contract from NASA for the final assembly of a space module for an upcoming mission. A team of engineers has determined the activities, precedence constraints, and time estimates as given in Table 19. 

a. Draw the AOA network for this project. 

b. Calculate total slacks and free slacks, and interpret their meaning. 

c. Determine the critical path and interpret its meaning. 

d. Construct a Gantt chart and identify scheduling flexibilities.

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TABLE 19 Activity Construct shell of module Order life support system and scientific experimentation package from same supplier Order components of control and navigational system Wire module Assemble control and navigational system Preliminary test of life support system Install life support in module Install scientific experimentation package in module Preliminary test of control and navigational system Install control and navigational system in module Final testing and debugging Symbol A B C D E F CH G H I J K Immediate predecessors A C B D, F D, F E. F H, I G, J Time estimate (days) 30 15 25 37 1 52 4 10 8