EWG-MCDA is one of the working groups of EURO. The Group was founded in 1975 by Bernard Roy. The main objectives of the group are to contribute to the development, at a European level, of an original way of thinking in the field of multicriteria decision aiding and to keep the group alive and open by means of bi-annual meetings which should not be mini-conferences but real meetings favourable to exchanges and to the emergence of new ideas.