Las prácticas de laboratorio de física en la formación del profesorado. Un análisis crítico.

We have proposed and founded the hypothesis that practical works done by future physics teachers in their university physics courses and in the teachers training centers do not give a correct view of a scientific approach. Results of the analysis of 91 lab guides, 54 estudents repports and some professors interviews are in accordance with this hypothesis, showing the need of a deep reestructure of the usual orientation of the practical works proposed to future physics teachers.