To complete the rotor assembly for an experimental spacecraft, Gilbert has laid out nine major activities involved. These activities have been labelled A to I in the table below, which also shows their estimated completion times (in weeks) and their immediate predecessors. EVENTS AND ACTIVITIES FOR ROTOR ASSEMBLY

ACTIVITIES TIMES (IN WEEKS) PRECEDING EVENT
A M B
A 1 2 3 -
B 2 3 4 A
C 4 5 6 A
D 8 9 10 A
E 2 5 8 B
F 4 5 6 B, C
G 1 2 3 F, D
H 1 3 5 E, F
I 2 4 6 H, G

Key: A is optimist time, M is the most likely time and B is the pessimistic time.

i. Calculate the expected time for each activity (9 Marks)

ii. Draw a Gantt Chart from the same information above (7 Marks)

iii. State the critical path and the maximum number of weeks the project will take to be completed. (3 Marks)

iv. Discuss the pros and cons of using the Gantt chart as a planning and scheduling tool? (6 Marks)