There are two obvious ways to ask the opinion of a set of people: join everyone in a room or set up an online questionnaire. While we think the former will always be the best way to foster the debate and exchange of arguments between people, it lacks the flexibility required to join people often geographically disperse and with tight schedules. Additionally, it makes no sense when the number of participants is very high. The later, on the other way, overcomes the problems of having many people at the same time in a room but makes it impossible to share people’s opinions. This is where Welphi comes handy. It not only provides the online resources to set up a questionnaire where each participants can answer it his own pace and place, but it also makes it possible to share participants answers and comments and ultimately allow any participant to change his/her answer after getting feedback from his peers.