Master Hydrohasards / Flood protection / river training for flood risk mitigation / 1
MCDA - Multicriteria analysis for decision aid
 for what?




decision aid
concertation and optimisation
acceptation and share
…magic tricks and propaganda
 example 1 : chosing a president
 application : flood risk mitigation
 chosing between different scenarios
Philippe Belleudy - 05-2012
Master Hydrohasards / Flood protection / river training for flood risk mitigation / 2
The different stages
1. precise the question
what / why / who
2.
3.
4.
5.
identify the different alternatives
selection of criteria and indicators
give a weight to the different criteria
determine the values of the indicators
for each different alternative
6. rate the alternatives
Philippe Belleudy - 05-2012
Master Hydrohasards / Flood protection / river training for flood risk mitigation / 3
stage 1 : precise the question
choosing a president
 What
 the guy who will run the country during the next 5 years
 Who
 the whole family decides what Mom will vote
Dad and his parents are non EU citizen
The kids are too young
Philippe Belleudy - 05-2012
Master Hydrohasards / Flood protection / river training for flood risk mitigation / 4
stage 2 : identify the different alternatives





Adam
Bacchus
Chloe
Demeter
Eve
Philippe Belleudy - 05-2012
Master Hydrohasards / Flood protection / river training for flood risk mitigation / 5
choosing a president
 at this point different methods may be used
 1st method : the ballot
 2nd method : elimination process
A/B >> A
A/C >> A
A/D >> D
D/E >> E
 3rd method : MCDA
Philippe Belleudy - 05-2012
Philippe Belleudy - 05-2012
Master Hydrohasards / Flood protection / river training for flood risk mitigation / 6
stage 3 : selection of criteria and indicators
criteria
indicator
gender
M/F
Environmental care
[0-10]
Honesty
scrooge/lizard/arranging/fair
Economical choices
communist<--------------liberal
…
Master Hydrohasards / Flood protection / river training for flood risk mitigation / 7
choosing a president
 at this point different methods may be used
agreement : the future president must be a woman
Philippe Belleudy - 05-2012
Master Hydrohasards / Flood protection / river training for flood risk mitigation / 8
stage 4 : give a weight to the different criteria
Philippe Belleudy - 05-2012
Master Hydrohasards / Flood protection / river training for flood risk mitigation / 9
stage 6 : rate the alternatives
1. precise the question
what / why / who
2.
3.
4.
5.
identify the different alternatives
selection of criteria and indicators
give a weight to the different criteria
determine the values of the indicators
for each different alternative
6. rate the alternatives
Philippe Belleudy - 05-2012
Master Hydrohasards / Flood protection / river training for flood risk mitigation / 10
stage 1 : precise the question
1. precise the question
what / why / who
2.
3.
4.
5.
identify the different alternatives
selection of criteria and indicators
give a weight to the different criteria
determine the values of the indicators
for each different alternative
6. rate the alternatives
Philippe Belleudy - 05-2012