Establishing links between research and practice

Lesson study is a professional development process that has become widely disseminated worldwide, corresponding to a small investigation of participants’ professional practice. In this article, our objective is to present aspects of the work of a lesson study, namely in its preparatory phase of documentation and preparation of the lesson plan and in its phase of post-lesson reflection. We pay special attention to the work of selecting and elaborating tasks, the foresight of the strategies and difficulties of the pupils, and the preparation and conduction of the whole-class discussion. We also show how the participating teachers see the lesson study. We point out the necessary conditions for undertaking lesson studies and show how the lesson study, as a formative activity based on practice, can be a powerful teacher professional development process.