Knowing the practices and documentary needs of research communities in different disciplines and different types of institutions is what the Couperin consortium is working on with the surveys carried out among researchers, teacher-researchers, engineers and doctoral students. These analyses are essential for understanding the changes at work in a period when science is opening up, when the costs associated with documentary resources are particularly high and when the economic models of scientific publication are engaged in a mutation with uncertain outcomes.This survey is part of the particular perspective of the renewal of the contracts for bibliographic and bibliometric tools. Its object is limited to documentary research practices. Sever...