The Egyptian parliamentary elections, scheduled for November 2010, will mark the beginning of a new phase in the succession process, as they will shape the Parliament which will be ruling when the new president - the fifth of the Republic of Egypt - will be elected, a few months later, in September 2011. In order to deepen our understanding of the Egyptian current political scene and of the challenges it is facing, it is useful to look at the composition of the outgoing Parliament, focusing especially on the major oppositionnal bloc, i.e. the Muslim Brotherhood.Since 2005, when it won 88 seats, the movement has been confronting harsh repression and will probably not be allowed to achieve such a performance again. A comparative survey of MB members of parliament's profiles enables us to analyze the dynamics of political elites production in Egypt, as well as it provides relevant information about the Brotherhood itself. Are there some specificities of MB political elitese What are the patterns of their territorial and social implantationt What is the role played by civil society institutions such as professional syndicates, caritative associations, student or labor unionsu Can we observe recent re-compositionsi As a matter of fact, few is known about the so-called << social bases >> of this << 82 year old >> Islamist movement, which seems to have overcome the various repressive waves it had to face. We believe that its presence in the Egyptian People Assembly represents a great opportunity to learn more about its relationships to society: on a methodological level, instead of explaining MB's electoral success by its supposed << social strength >>, we suggest using the MB parliamentary bloc as a site of investigation on the nature of their social anchorage. I will not only compare the 2005 Muslim Brothers MPs' profiles to other MPs' ones, but I will also intend to do so between the 2005 MB bloc and previously elected Brothers, as far as available information allows me to do so. This analysis, involving statistical methods, will be drawn up on a database which I created from diverse biographical sources (mainly the MB's websites) and from existing studies about the 1984, 1987 and 2000 legislative elections.