In this article we present the basic guidelines proposed for the Guidance, Information and Employment Center (COIE) of the National University for Distance Education (UNED) for the development, management, and evaluation of educational co-operation contracts for field experience in businesses, in which students are requesting to participate with greater frequency. The beginning of this research focuses on the supervision of the development of these programs, and establishing guidelines and design procedures in order to follow-up to improve them. The conclusions presented here are drawn from results that were obtained in the evaluation of internships during the academic course 1998/99 and 1999/00, according to the perspective of the participating enterprises observing student interns, and are organized into a proposal. Resumen