Report: The drawing of lots for participants in "representative deliberative processes" ultimately selects volunteers (see Volume A: halshs-03910234v2). Therefore, in order to ensure the representativeness of the mini-public, it is essential to measure the selection biases that recruitment introduces by differentially mobilizing certain motivations to participate and by making acceptance dependent on the availability to do so. Even if the socio-demographic structure of the mini-public is close to that of the general population – which is the case for the French Citizens' Convention for Climate (CCC) – recruitment may have selected citizens with preference profiles that are quite different from the population. This volume examines this aspect of the CCC's descriptive representativeness by comparing citizens' responses at the beginning of the Convention to questions asked in national surveys on selected general political and climate-related variables.