Post on 07-Jan-2016
description
Network & Gantt chart
Project management(lecture)
Why to translate a network to a Gantt chart?
• Gantt chart is more readily to understood by ‘unskilled’ people. It is especially useful when presenting to the top management.
• Progress can be easily displayed on it• Visualise floats and activity times. Effective
explanatory and teaching instrument.• Resource allocation can be performed on it.
Two ways af translating networks into bar chart
• Calculating activity times and loacting these on the bar chart
• Drawing activities directily to a time-scale, using the node numbers ensuring correct relationships (time-scaled network)– AoA type– AoN type
The time-scaled network (AoA)
• Mark activities by nodes (events)• Any dummy must be drawn in as a vertical line
with its head and tail node-labels• Activitiy bars will fall from top-left to bottom-
right. Dependent activities are always lower in the chart.
The time-scaled network (AoA)
41
3
42
0 10 15 20 25 305
a
b
c
dburst merge
free float
10
0
27
13a7
423
23
c10
315
15
b15
d8
Dummy activities on a time-scaled AoA network
a15
10
0
215
20
4 2525
3 2020
b
20c5
dummy
a
b c
Time-scaled AoN network (example 1)
• Re-draw the first AoA project as an AoN network:
START
0 00
0 00
0
FINISH
20 200
20 200
0
b
0 150
0 1515
0
a
0 76
6 137
0
d
15 200
15 205
0
c
7 170
13 2310
0
• On AoN networks start and finish activities should be created if thereis no single starting/ending activities.
Translate standard AoN to a time-scaled network
0 10 15 20 25 305
FINISH
7 17 23
START
a c
b d
Re-draw the second AoA:
Time-scaled AoN network (example 2)
START
0 00
0 00
0
FINISH
25 250
25 250
0
b
0 200
0 2020
0
a
0 155
5 2015
5
c
20 250
20 255
0
Translate it to a time-scaled network.
Solution
0 10 15 20 25 305
START
a
cb
FINISH
Time-scaled AoN network(individual exercise)
START
0 00
0 00
0
e
10 130
10 133
0
d
2 73
5 105
3
c
2 100
2 108
0
b
0 55
5 105
5
a
0 20
0 22
0
FINISH
13 130
13 130
0
Solution0 10 15 20 25 305
START FINISH
d
b
a c
Reading
• Lockyer – Gordon (2005): Chapter 16
Thank you for the attention