Problems in value aggregation
There is a function describing group preferences but it may be difficult to define in practice
Comparing the values of different DMs is not straightforward
Solution:
- Each DM defines her/his own value function
- Group preferences are calculated as a weighted sum of the individual preferences
Unequal or equal weights?
- Should the chairman get a higher weight
- Group members can weight each others’ expertise
- Defining the weight is likely to be politically difficult
How to ensure that the DMs do not cheat?
See value aggregation with value trees