It all started with an intuition, confirmed during my post-graduate studies. Then, I conducted a research project testing an improvisation training scenario (inspired by Lobman, 2005, and my thesis) for teachers undergoing professional integration. It was made up of improvisation exercises and reflective activities to generate feedback on the experience. The results, published in 2021 in the Swiss Journal of Educational Research, enable to update a referential of interactive classroom management skills for dealing with the unexpected. It also documented teachers' perceptions of the development of their skills following the laboratory experiment and revealed the most effective exercises for building those skills. This study gave rise to the Applied Improvisation Laboratory, a novelty in teacher training on Quebec territory, now offered in Montreal. A whole new world is opening up for this practical training tool, well suited to an educational world destined to undergo major changes in the future.