Evrest (EVolutions et RElations en Santé au Travail) is a monitoring system, with data collected year after year by a questionnaire that was developed by a team of occupational physicians and researchers working together, in order to monitor and analyze various aspects of work and employee health. A national database on a sample of employees is thus being created that can be used for scientific work, but it also allows each doctor (or team of doctors who wish to coordinate their work) to make use of Evrest beyond the national sample in relation to their own concerns. Its development is part of a process aiming to reconcile the diverse and specific requirements of both professional worlds. It involved designing and sharing « objects » in a way that would satisfy all the stakeholders. It also meant the gradual development of innovative ways for networking and exchanges.