The following table provides the predecessors and the three estimates of the duration of each activity.

Activity	Predecessors	Duration Estimations
		Optimistic (a)	Pessimistic (b)	Most Likely (m)
A- set up project	-	4	12	5
B- determine customer requirements	A	2	4	3
C- prepare SRS document	B	6	22	8
D- create test plans	C	4	8	6
E- implement system	C	3	5	4
F- developer testing	E	2	6	4
G- system testing	D, F	2	4	3
H- create user manuals	C	5	15	7

1. Calculate expected activity durations of each activity
2. Draw the PERT network diagram. Calculate earliest and latest starting and finishing times of each activity (apply forward and backward passes). For each activity, show all these calculations in a table. Table will look like

Early Start	Task Name	Early Finish
Slack Time
Late Start	Duration	Late Finish

3. Determine the critical path and expected duration of the project