Research in Prehistory is currently at a critical impasse. Sites discovered in a preventive context are rarely excavated and the protective measures applied are often insufficient to protect them. This observation constitutes an important limit for the progression of our knowledge. Prescription and preservation problems of the sites, passing through the questions of detection and characterization of occupations, at each stage, the authors set out avenues for reflection and improvement for better taking into account the specificities of research from the Paleolithic periods prior to the Last Glacial Maximum.