Jean-Jacques Dordain, ESA's Director General, put the refusal to fund the study into context: "It is not a question of member states for and member states against. I think the decision could not be taken for reasons that are not linked to Clipper itself. The decision could not be taken because of budgetary restraints." Dordain concluded that he was convinced that European support for Kliper was vital for ESA's future involvement in space transport and that a favourable decision can be achieved until June 2006. In concluding "We need two transportation systems in the world", Dordain also outlined shortly after the European Space Summit that the primary requirement of Europe's involvement in the Kliper project was to rely on two separate systems to support the ISS as had been proven vital after the Columbia Space Shuttle disaster in 2003.