Indicators for Sustainability Assessment in the Procurement of Civil. . .
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Fig. 4 HD for the case
example WWTP 1
V2
V1
high
low
V3
Fig. 5 HD for indicator
analysis for the case example
in WWTP 1
low
l20
l10
l8
l18.1
l18.2
high
l6
l1
l3
l11
l13
3.2 Indicator Analysis
First, HDs for all case examples and the entirety of all case examples were
developed, whereby now the indicators are considered as objects (vertices in the
HD) evaluated by the variants. Each of the HD formed certain subsets, for example
as shown below for the exhaust air treatment in WWTP1 (see Fig. 5). The chains
I6 > I1 und I8 > I3 > I10, I8 > I3 > I20, I8>I11>I10, I8>I11>I20 and I18.1
> I13 were identified. The indicators I16, I22 and I23 are equivalent to I8 and
are therefore not visible on the HD. The object I18.2 is an isolated object. The
degree of separation among those subsets was analysed with the PyHasse module
“sepanal15_4”. The comparison of the subsets C1 (I6, I1) with C2 (I8,I3,I10), C3
(I8,I3,I20), C4 (I8,I11,I10), C5 (I8,I11,I20) and the component C6 (I18.1,I13) with
C4 shows a high degree of separation in the variants 2 and 3. The indicator group can
be separated by these two variants in a present separation . The scatter plot of Fig. 6