This work details research carried out by the GESTEPRO laboratory concerning technological education; the acronym stands for 'Groupes de Recherche en Éducation Scientifique, Technologique et Professionnelle' (Research Team in Scientific, Technology and Vocational Education). The laboratory, created around five years ago, integrates the combined fields of research on learning, didactics, evaluation; a training programme which organises research into education in the Aix-Marseille region. GESTEPRO brings together researchers from diverse backgrounds such as educational, material and life and earth sciences, psychology, even different sectors of industrial engineering-people who are interested in scientific, technological and professional education. The common interest lies in a particular type of research; the processes for transmitting and applying knowledge in the specific domain of teaching methods, and the retransmission of scientific, technological and professional expertise to others. Such an approach confines the team's research to situations found in schools, middle schools, high schools, universities and professional training centres; in other words, any situation where a teacher relays knowledge to the pupils. The GESTEPRO team was established at the end of a lengthy process of creating teams for research in technological and scientific education. As far as technological education is concerned, the status of such teachings as being compulsory for all pupils in primary and secondary education, in 1985, was accompanied by an important teacher training programme, be it introductory or long term. The long term or continuous training was concerned with converting teachers of 'manual' subjects, competent in disciplines such as cookery, handicrafts, wood and metal work... into domains which were largely unfamiliar to them, like mechanical construction, electrical engineering, business economics, or even information technology. This teacher reconversion programme, conducted over a one year period due to its vastness and complexity, generated a dynamic upsurge in resource development, educational tools and teaching aids, thus helping to initiate ways of thinking which would go on to constitute the basis for university research. For the second group, introductory training progressively defined itself as the reference point required by teachers to get to grips with such knowledge, in order to put into practice a mode of teaching of which the content, application and organisation was somewhat out of the ordinary.