Dave fletcher was able to determine the activity times for constructing his lase
ID: 332909 • Letter: D
Question
Dave fletcher was able to determine the activity times for constructing his laser scanning machine. Fletcher would like to determine ES, EF, LS, LF and slack for each activity. The total project completetion time and the critical path should also be determined. Here are the activity times:A. Dave’s earliest start (ES) and earliest finish (EF) are?
B. Dave’s lastest start (LS) and latest finish ( LF) are:
C. The stack slack tones are:
The activities on the critical path are ?
The total project completetion for Dave = ? Weeks
Explanation / Answer
Activity
Duration
ES
EF
LS
LF
Slack time
A
6
0
6
5
11
5
B
8
0
8
0
8
0
C
2
6
8
11
13
5
D
1
6
7
16
17
10
E
5
8
13
8
13
0
F
6
8
14
11
17
3
G
11
13
24
13
24
0
H
7
14
21
17
24
3
Slack time is the time which can be delayed in each process without affecting the total time of the project.
Slack can be calculated as two ways –
Here we used Finish slack.
The critical path is a path which has slack time zero because no delayed are there.
The critical path here is B-E-G.
Activity
Duration
ES
EF
LS
LF
Slack time
A
6
0
6
5
11
5
B
8
0
8
0
8
0
C
2
6
8
11
13
5
D
1
6
7
16
17
10
E
5
8
13
8
13
0
F
6
8
14
11
17
3
G
11
13
24
13
24
0
H
7
14
21
17
24
3
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