multiple dependency activity on node (aon) networks ( lecture )
TRANSCRIPT
Multiple dependency activity on node (AoN) networks
(lecture)
Four possible dependencies between activities
• Finish-to-start (or normal) dependency• Start-to-start dependency• Finish-to-finish dependency• Start-to-finish dependency
Finish-to-start (or normal) dependency
a
0 30
0 33
b
7 90
7 92
4
00
Start-to-start (or lag-start) dependency
x
0 30
0 33
y
4 60
4 62
400
Example: the air-conditioning should be started in a building a given time before visitors are let inside
Finish-to-finish (lag-finish) dependency
c
0 30
0 33
d
5 70
5 72
4
00
Example: c: writing a chapter to a bookd: editing the whole book lag: acceptance of the chapter by the reviewer
Start-to-finish dependency
a
0 60
0 66
b
2 40
2 42
4
00
Example: a: production with a new machineb: quality checklag: to ensure the coverage for the test production with quality checking
Dependencies can be used in combination
Start-to-start & finish-to-finish:
a
0 3?
0 33
b
5 9?
7 92
5
6
??
Example: a: marketing actionb: measuring the effect of the actionlags: the effect needs time to appear, and to fade out
Floats on multiple dependency networks
• Total float = LFT – EST – Duration
• Early total float = LFT – EFT• Late total float = LST – EST
• In case of multiple dependence free float cannot be calculated
Solution
a
0 30
0 33
b
5 92
7 92
5
6
Calculations with finish-to-start lags
a0
0 3
b3
c3
f3
d3
e3
g3
h3
4
3
5
1
2
1 2
Calculations with finish-to-start lags
a0 30
0 33
b6 96
12 153
c7 100
7 103
f20 230
20 233
d4 76
10 133
e15 180
15 183
g18 213
21 243
h24 270
24 273
4
3
5
1
2
1 2
0
0
000
6
6
3
Various dependencies
a0
0 1
b2
c3
f1
d4
e4
g5
h3
4
3
5
1
2
1
2
5
2
Dangler activities!
Various dependencies
a0 10
0 11
b4 613
14 192
c5 80
5 83
f9 1910
19 201
d2 516
18 224
e13 170
13 174
g17 220
17 225
h20 241
21 243
4
3
5
1
2
1
2
5
2
Practicing
a0 40
0 44
b3
d2
c7
e4
5
1
2
3
4
Practicing
a0 40
0 44
b4 79
13 163
d8 109
17 192
c9 160
9 167
e19 230
19 234
5
1
2
3
4
Reading
• Textbook chapter 15
Thank you for listening