Activity	Pre	Time (Days)	ES	EF	LS	LF	Critical	Slack
A	Formulate Budget	NA	10
B	Choose Location/ Purchase Property	A	30
C	Obtain Permits	B	15
D	Develop Playground Design	C	10
E	Determine Playground Equipment	D	5
F	Purchase Equipment	E	5
G	Assign Tasks to Workers	F	2
H	Develop Deadline for Project	G	2
I	Begin Work	H	2
J	Monitor Project Progress	I	40
K	Complete Playground	J	121

How to calculate ES, EF, LS, LF AND SLACK