- The immediate care of your request, - The proposed analysis in line with the issues raised, - A rigorous and reasoned analytical approach , based in particular on a thorough knowledge of the methods used, the conditions for implementing optimal limits, - A methodology ensuring a scientifically rigorous result , - Close cooperation with teams searching to determine the "feasibility" studies and relevance sampling, and to reflect on the use of results for the understanding of the site, - A critical synthesis of data obtained, - Time of study very small . CARACTERISATION CONSERVATION EXPERTISE