How study the potential effects of public participation on social request for more participation? Can the implementation of participatory settings convince the population of the cogency of this institutional participation? These questions have recently provoked a scientific debate, which opposes various works, based on opinion surveys and statistical methods. This communication proposes to enter this debate, in order to deal with the interest of the use of quantitative methodologies within the "real world" of the participation. We propose to exploit data coming from a survey dealing with the knowledge and the opinion of the French population on participatory democracy. Then, two central results emerge from our work: on the first hand, our p...