Question

1. Based on the following table, calculate the ES, EF, LS, LF and Slack for each activity using an expected completion time of 16 weeks. Please use the table format presented in the text to solve this problem. Please create one table with the original plan and a second table with the updates based on actual performance.

What is the critical path for the original project? If the critical path changes as a result of actual progress, identify the new critical path.

Can the project be completed on time? If necessary, identify activities you would focus on to get the project back on schedule.

Activity	Estimated Time	Actual Finish Time	Immediate Predecessor(s)
A	3	2	-
B	3	6	-
C	4	8	A
D	5		A,B
E	4		B
F	5		C,D,E

Answer 1

Original network

Activity	ES	EF	LS	LF	Slack
a	0	3	0	3	0
b	0	3	0	3	0
c	3	7	4	8	1
d	3	8	3	8	0
e	3	7	4	8	1
f	8	13	8	13	0

MOdified network

Activity	ES	EF	LS	LF	Slack
a	0	2	1	3	1
b	0	6	0	6	0
c	2	10	3	11	1
d	6	11	6	11	0
e	6	10	7	11	1
f	11	16	11	16	0

Yes. The project can be completed in 16 days despite the delay. However, activities B,D and E form critical path and need to be taken care of to ensure that it completes on time.