Primary school teachers in Québec suffer psychological distress, as shown by the Québec Health Survey (M. Gervais, 1993; Santè Québec, 1995). The authors applied and extended the French model (F. Guérin, A. Laville, F. Daniellou, J. Duraffourg, & A. Kerguelen, 1991) of analysis of work activity to observing classroom teaching (14 women in 10 classrooms for a total of 48 hr 24 min) to identify stressful elements. The authors observed a rapid sequence of actions, eye fixations of short duration, little physical or mental relaxation, multiple simultaneous activities, and uncomfortable temperature and humidity levels. Teachers use many strategies to teach, to create a learning environment, and to maintain attention in classrooms under adverse conditions. Examination of these strategies led to recommendations to improve relations between the teachers and their supervisors and to make the classroom an easier place to teach.