GIVEN INFORMATION Normal Duration
Crashed
Activity Pred.
(weeks)
Duration (weeks)
A
20
15
B
11
8
C
9
9
D
A, B
6
4
E
C
4
3
F
E
8
6
G
D, F
4
2
H
D
2
1
The objective was to identify the lowest crash activity per week item.
Doing this creates two critical paths now.
A, D, H
A, D, G =
= 28 weeks
28 weeks The next step is to locate an activity, within those two critical paths, th
reduce the number of weeks again. D can be reduced from 4 to 2 and doing so reduces 28 weeks to 26 w
A, D, H
A, D, G =
= 26 weeks
26 weeks The next objective is to reduce it down to 25 weeks….. A can be reduced by 1 week which meets the objective of 25 weeks.
A, D, H
A, D, G =
= 25 weeks
25 weeks N COMPUTED INFORMATION Normal
Cost
$ 2,000
$ 1,200
$ 1,500
$ 1,800
$ 500
$ 500
$ 800
$ 500 Crashed
Cost
$ 3,000
$ 1,350
$ 1,500
$ 2,100
$
900
$
600
$
950
$ 1,200 Normal
Duration
Minus
Crashed
Duration
5
3
2
1
2
2
1 Crashed
Cost
Minus
Normal
Cost
$ 1,000
$
150
$
$
300
$
400
$
100
$
150
$
700 Crash Cost
Per Week
$
200
$
50
$
$
150
$
400
$
50
$
75
$
700 ctivity per week item. The answer is G, G reduces weeks from 4 to 2. e two critical paths, that can be reduced next to see if you can uces 28 weeks to 26 weeks. eks….. bjective of 25 weeks. RMATION Critical Path Weeks Total
Activity
Crashed Cost
Yes
1 $ 200 rom 4 to 2. Yes 2 $ 300 Yes 2 $ 150
5 $ 650 Activity Immediate Predecessor(s)
A
B
C
D
A
E
B
F
C
G
D
H
E, F Activity
A
B
C
D
E
F
G
H Duration (Weeks)
3
8
7
9
6
9
11
5 What is the duration of the project (in weeks)? What is the earliest week you could start activity H? What is the latest week you could start activity B? What is the slack time for activity F? What is the latest week you could finish activity D? What would be the overall duration of the project if activity E were inc What would be the overall duration of the project if B were increased Immediate Predecessor(s)
A
A
A
A
B, C
D, E
F, G ct (in weeks)? uld start activity H? A
3 B
8 F
9 A
3 C
7 F
9 A
3 D
9 G
11 A
3 E
6 G
11 Activity
A
B
C
D
E
F
G
H Time d start activity B? d finish activity D? on of the project if activity E were increased by 2 weeks (from 6 to 8 weeks) on of the project if B were increased by 4 weeks (form 8 to 12 weeks)? H
5 25 H
5 24 H
5 28 H
5 25 ES EF Critical Path LS LF D Critical Path
Yes Yes Yes
Yes (from 6 to 8 weeks)? to 12 weeks)? 3
8
7
9
6
9
11
5 0
3
3
3
3
11
12
23 3
11
10
12
9
20
23
28 N
ES
EF
LS
LF
D Legend
Activity Name
Earliest Start Time
Earliest Finish Time
Latest Start Time
Latest Finish Time
Activity Duration ES LS N EF LF
D

 

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