PERT CPM Problem.

In one of the little-known battles of the Civil War, General BOB lost the Third Battle because his preparations were not complete when the enemy attacked. If the critical path method had been available, the General could have planned better. Suppose that the following planning data had been available.

1. Draw the project network graph.
2. Determine the early-start times, late-complete (finish) times for each activity.
3. Identify the critical path and the time between the general's receipt of battle orders and the onset of battle.
4. Determine the earliest completion (finish) times, latest start times and total float times of all the activities.

Activity	Description	Predecessors	Duration
A	Develop Plan	none	2 days
B	Move engineering division	A	2
C	Advance cavalry scout	A	5
D	Army march	A	4
E	Build pontoon bridges	B, C	4
F	Cavalry reconnaissance	C	3
G	Plan fortifications	C	1
H	Troops build earthworks	D, G	3
I	Create supply lines	E	2
J	Artillery placement	F, H	1
K	Cavalry disrupts enemy supply	F, H	3
L	Attack	I, J, K	1