A generated schedule with several construction alternatives
has to be rated and evaluated to achieve one solution for the initial
execution problem that will be realized on-site. To allow a
multi-criteria evaluation of construction alternatives, a decisionsupport
system has been developed as a part of our research
activities. The decision-support system is defined as the tuple
DSS = (A; O; C; M), where A is a set of alternatives with ratings
for each criterion, O a set of project objectives, C a set of criteria with normalization functions, and M a set of decision support
methods (e.g., Fig. 10).
The first step in a multi-criteria decision process is to synchronize
diverging effects of criteria on project objectives before superimposing
them. This implies higher rating values to describe
positive effects on objectives and lower values to characterize negative
effects. To combine the total rating values of an alternative,
all rating values are mathematically normalized in an automatic
process. After applying weighting and aggregation methods, exactly
one overall rating value can be determined for each alternative
and, consequently, the alternatives can be evaluated and
ranked to support the project manager during the decision process.
Several methods can be found in the literature for the determination
of criteria weightings and the aggregation of rating values under
the impact of different criteria.