22 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 TABLE 19 Immediate Time estimate Activity Symbol predecessors (days)
Construct shell of module A – 30 Order life support system and B – 15 scientific experimentation package from same supplier Order components of control C – 25 and navigational system Wire module D A 3 Assemble control and navigational E C 7 system Preliminary test of life support F B 1 system Install life support in module G D, F 5 Install scientific experimentation H D, F 2 package in module Preliminary test of control and I E, F 4 navigational system Install control and navigational J H, I 10 system in module Final testing and debugging K G, J 8

a. Draw the AOA network for this project. (Hint: You should have 10 events and two dummy activities.)

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.