1. Dream Team Productions, a firm hired to coordinate the release of the movie Paycheck(starring Uma Thurman and Ben Affleck), identified 16 activities to be completed before the release of the film. The tasks (in time units of weeks) are as follows:

Activity	Immediate Predecessors	Optimistic Time	Most Likely Time	Pessimistic Time
A	-	1	2	4
B	-	3	3.5	4
C	-	10	12	13
D	-	4	5	7
E	-	2	4	5
F	A	6	7	8
G	B	2	4	5.5
H	C	5	7.7	9
I	C	9.9	10	12
J	C	2	4	5
K	D	2	4	6
L	E	2	4	6
M	F, G, H	5	6	6.5
N	J, K, L	1	1.1	2
O	I, M	5	7	8
P	N	5	1	9

a) How many weeks in advance of the film release should Dream Team have started its marketing campaign? What is the critical path?

b) If activities I and J were not necessary, what impact would this have on the critical path and the number of weeks needed to complete the marketing campaign?