IUFM is a centre for the in-service training of teachers and the development of didactic research. IUFM contribution to the SEDEC project is essentially built on a reflexion on educational implications of the links between science and European citizenship. We are convinced that European citizenship may be developed in scientific activities in school, by the introduction of communication moments, where pupils have to express and defend their ideas, and also to understand and accept the others’ ones. We have implemented two activities using the results of the SEDEC survey on science perception, that make the pupils get a better view on scientific research, especially in the knowledge of two scientific “jobs”, astronomer and botanist. Our approach consists of allowing the children express their conceptions of these jobs, of organising a debate to clarify these ideas, and of confronting them with other pupils’ opinions in Europe, with the history of the involved science and with direct testimonies of scientists. The project should be pursued in allowing classes in Europe to communicate about a scientific problem and so, to live their European citizenship.