A project has been defined to contain the following list of activities along with their required times for completion.

Activity No.	Activity	Time (weeks)	Immediate Predecessors
1	Collect requirements	3
2	Analyze processes	2	1
3	Analyze data	2	2
4	Design processes	6	2
5	Design data	3	3
6	Design screens	2	3,4
7	Design reports	4	4,5
8	Program	5	6,7
9	Test and document	7	7
10	Install	2	8,9

a. Draw a network diagram for the activities.

b. Calculate the earliest expected completion time.

c. Show the critical path.

d. What would happen if activity 6 were revised to take six weeks instead of two weeks?