Des pratiques sociales à la classe : 
élaborer des connaissances de chimie au collège.
DIALLO,Alfa Oumar, 2000
Key-words : teaching, social practice, acting knowledge, schooling knowledge

In the guinean context of science education where the objet of scientific discours present, this study suggests a collaboration between school and local craftmen using acting knowledge to carry out chemical phenomena.
An enquiry involving junior secondary school pupils is testing the relation established between schooling knowlege and living context. Interviews from a few teachers are used to assess the psylogical feasibility of this collaboration as can exist. The core of the study consists of an analysis of social practices seen from craftsmen together with their own dicourse tegarding their practices, so as to identify what can be usable in a school project. Eventualy. some activities to give practice to pupils in this respect, have then been designed and tested.