Question

From the following information, develop an AON project network. Complete the forward and backward pass, compute activity slack, and identify the critical path. How many days will the project take? ID Description Predecessor Time A Survey site None 3 B Excavate site A 5 C Install power lines B 2 D Install drainage B 5 E Pour foundation C, D 4 The project will take _ days. The critical path is _ The late start on Activity C is _ days. The slack on Activity C is _ days. The slack on Activity D is _ days. The early start on Activity E is _ days.

Answer 1

ACTIVITY	DURATION	ES	EF	LS	LF	SLACK
A	3	0	3	0	3	0
B	5	3	8	3	8	0
C	2	8	10	11	13	3
D	5	8	13	8	13	0
E	4	13	17	13	17	0

FORWARD PASS = ES = MAX EF OF THE PREDECESSOR

EF = ES + DURATION

BACKWARD PASS = LF = MIN LS OF ALL SUCCESSORS

LS = LF - DURATION

CRITICAL PATH = PATH WITH LONGEST DURATION AND 0 NET SLACK

CRITICAL PATH & DURATION

A + B + D + E = 17