This thesis focuses on the teachers' practices in a technological environment. It aims at contributing to the dimension of 'teacher' research on the integration of technologies in the teaching of mathematics. The dimension, which has developed recently, aims to take into account the difficulties that this integration meets. Based upon the results of earlier research, we have defined two axes for our field of study: the complexity of the situations of integration of technological tools for the teacher and the variability of the practices. According to these axes, part of the idea is that the teachers' classroom management is deeply marked by the constraints and opportunities of the technological tools. The phenomena which results from this, ...