Decisions on technical issues musts imultaneously satisfy several conflicting objectives. Several methods have been developed to help identify the“optimal”decision.Such decisions are made by politicians but experts, constructors and the society must have the ability to overview and influence these decisions. The interaction of the different groups can be implemented using a web platform. The criteria to optimize this platform and its architecture are analysed. The aim is to give to non-expert users a general view of the problem and the solutions suggested, and help them form an informed opinionon at echnical problem.At the same time it would help politicians and experts to take into account the public opinions in decision making.