Aggregation of Individual Judgements
Given a hierarchy, the decision makers input their judgements in each level. In this kind of aggregation, judgements are aggregated in each level of hierarchy. Forman and Peniwati (1998) state that
“individual identities are lost with every stage of aggregation and a synthesis of the hierarchy produces the group’s priorities.”
N decision makers will generate at least N judgement matrices. A judgement matrix is the matrix that contains the pairwise comparisons of criteria and alternatives. In this type of aggregation, the pairwise comparison matrices are aggregated using Geometric Mean.
Aggregation of Individual Priorities
Each decision maker input his/her own judgment in the judgment matrix for each level of the decision tree. In the end, the final priorities of the alternatives are calculated. Those final priority matrices are aggregated and give the final group ranking of alternatives.
Escobar and Moreno-Jimenez (2007) suggested another method called Aggregation of Individual Preference Structures (AIPS).
In this type of aggregation the decision problem is solved N times. This means that the priorities of each decision maker are computed. Those priorities are aggregated using Geometric mean.
The figure below shows the difference between the two methods of aggregation.
Figure 2-4. Aggregation using AIJ and AIP
2.8.2 Aggregation of judgements in ...
... middle of paper ...
...ble alternatives should be clearly declared 3. The group members should be aware of the positive outcomes from the implementation of each alternative. The decision makers should exactly know the positive effects of each alternative. 4. The negative effects of each alternative should be clearly declared. The decision makers should understand what exactly the negative results are of each alternative. Hirokawa (1985) conducted research upon functional perspective in discussion formats n order to check where the quality of decision is increased. The discussion formats are the following:
1. Reflective – thinking format
2. Ideal – Solution format
3. Single – Question format
4. Free Discussion format
Hirokawa (1985) showed that the effectiveness of the group decision making is totally influenced by the functional perspective regardless of the discussion format.
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