Problem 2

Activity	Immediate Predecessor	Normal Time (Days)	Normal Cost ($)	Crash Time (Days)	Crash Cost ($)
A	-------	12	5,000	10	9,000
B	-------	10	4,000	8	6,000
C	A	14	6,000	12	7,000
D	B	8	3,000	6	4,000
E	A, B	9	5,000	9	5,000

(a) Draw the Precedence Diagram for the above project, complete with ES, EF, LS, and LF.

Answer:

First draw the network on a separate sheet of paper and then fill the following table:

Activity	Immediate Predecessor	Normal Time	ES	EF	LS	LF	Slack	Critical Path?
A	-------	12
B	-------	10
C	A	14
D	B	8
E	A, B	9

(b) What is the Critical Path?

Answer:

Critical Path:

(c) What is the Project Completion Time under normal schedule?

Answer:

Project Completion Time;

(d) If the total project time has to be crashed by TWO days, which activity will you choose and what is the extra cost?

Answer:

Activity to be Crashed:

Extra Cost: