Household surveys carried out by INSEE are mainly face to face surveys. In order to reduce field costs, it appears necessary to concentrate surveys in specific areas called primary units. In order to keep a stable interviewer network, INSEE uses a Master Sample system: Primary Units are drawn at once at the beginning of the system, and will be used for all surveys drawn in the Master Sample (with exception of LFS survey). According to international good practices, primary units shall be renewed each ten years. The current Master Sample started in 2009, and Primary Units shall be renewed at the end of 2019. Renewing the Primary Units is also an opportunity to redesign The Master Sample, taking advantage of new sample frames available based on tax payers' files. The actual INSEE Master Sample is namely based on the French rolling census (with the yearly Census samples used as sample frames), but the Census Rotation Groups that were drawn in 2003 are becoming less and less representative. It was therefore necessary to undertake a specific reflexion on the sample frames used by INSEE for social surveys. The Labour Force Survey sample is specific, as it is composed of clusters of 20 dwellings, as close as possible, due to the shorts period after the reference week to carry out the survey. A cluster is quarterly surveyed, during six quarters. Groups of 6 quarters (sectors) are built: when a cluster has been fully surveyed, another one from the sectors replace it in the sample. The LFS sample is therefore calibrated to last 9 years. As the current LFS sample started in summer 2010, the next LFS sample will enter into force in summer 2019, and shall be therefore redesigned at that time