2. Environmental Criteria
The environmental criteria have an overall normalised weight of 0.4. This is
divided 30% in favour of noise impact, 10% to air impact, 40% to landscape impact
and 20% to amenity impact. The final weighting for the four sub-criteria is thereby as
follows:
Noise pollution impact ¼ 0.4 Â 0.3 ¼ 0.12
Air pollution impact ¼ 0.4 Â 0.1 ¼ 0.04
Landscape impact
¼ 0.4 Â 0.4 ¼ 0.16
Amenity impact
¼ 0.4 Â 0.2 ¼ 0.08
Total
¼ 0.40
3. Political Criteria
The political criteria have an overall normalised weight of 0.3. This is divided
25% in favour of political acceptance locally and 75% to political acceptance
nationally. The final weighting for the two sub-criteria is therefore as follows:
Level of political acceptance locally
¼ 0.3 Â 0.25 ¼ 0.075
Level of political acceptance nationally ¼ 0.3 Â 0.75 ¼ 0.225
Total
¼ 0.30
Thus, all options are assessed on the basis of the above eight criteria of evaluation, whose normalized weights are as follows:
Construction cost
¼ 0.21
Efficiency in construction
¼ 0.09
Noise pollution impact
¼ 0.12
Air pollution impact
¼ 0.04
Landscape impact
¼ 0.16
Amenity impact
¼ 0.08
Level of political acceptance locally
¼ 0.075
Level of political acceptance nationally ¼ 0.225
Total
¼ 1.00
Solution 15.7(ii)
In this case the economic criteria have a total weighting of 60%, with the other
criteria sharing the remaining 40% in a ratio of 4:3. Thus environmental criteria have
a total weight of 40 Â (4/7) and political criteria have a total weight of 30 Â (3/7).
The relative weights of the main criteria are thus as follows:
C 1
¼ 0.60
C 2
¼ 0.23
C 3
¼ 0.17
Total = 1.00
The relative weights of the sub-criteria remain the same. The weightings for the
sub-criteria are thus as follows (Table 15.19):
15.6 Allocating Weights to the Decision Criteria
435
The environmental criteria have an overall normalised weight of 0.4. This is
divided 30% in favour of noise impact, 10% to air impact, 40% to landscape impact
and 20% to amenity impact. The final weighting for the four sub-criteria is thereby as
follows:
Noise pollution impact ¼ 0.4 Â 0.3 ¼ 0.12
Air pollution impact ¼ 0.4 Â 0.1 ¼ 0.04
Landscape impact
¼ 0.4 Â 0.4 ¼ 0.16
Amenity impact
¼ 0.4 Â 0.2 ¼ 0.08
Total
¼ 0.40
3. Political Criteria
The political criteria have an overall normalised weight of 0.3. This is divided
25% in favour of political acceptance locally and 75% to political acceptance
nationally. The final weighting for the two sub-criteria is therefore as follows:
Level of political acceptance locally
¼ 0.3 Â 0.25 ¼ 0.075
Level of political acceptance nationally ¼ 0.3 Â 0.75 ¼ 0.225
Total
¼ 0.30
Thus, all options are assessed on the basis of the above eight criteria of evaluation, whose normalized weights are as follows:
Construction cost
¼ 0.21
Efficiency in construction
¼ 0.09
Noise pollution impact
¼ 0.12
Air pollution impact
¼ 0.04
Landscape impact
¼ 0.16
Amenity impact
¼ 0.08
Level of political acceptance locally
¼ 0.075
Level of political acceptance nationally ¼ 0.225
Total
¼ 1.00
Solution 15.7(ii)
In this case the economic criteria have a total weighting of 60%, with the other
criteria sharing the remaining 40% in a ratio of 4:3. Thus environmental criteria have
a total weight of 40 Â (4/7) and political criteria have a total weight of 30 Â (3/7).
The relative weights of the main criteria are thus as follows:
C 1
¼ 0.60
C 2
¼ 0.23
C 3
¼ 0.17
Total = 1.00
The relative weights of the sub-criteria remain the same. The weightings for the
sub-criteria are thus as follows (Table 15.19):
15.6 Allocating Weights to the Decision Criteria
435