This research was carried out by a group of 23 kindergarten and pre-school teachers involved in a project on continuous formation in an academic environment. Their question for investigation was: which dynamics experienced by a group of undergraduate kindergarten and pre-school teachers allowed the professional learning of mathematics? The aims of the research were (1) to identify the types of theoretical interpretations and working dynamics for the integration of theory and practice that produce meanings for the reflections on the teaching practice, and (2) to analyze the formation contexts in which the teacher becomes an investigator of his/her own practice. It is a qualitative approach whose documentation includes a starting questionnaire (personal characteristics), reflective registers on the importance of games and the dynamics experienced by the formation group, and an investigation work developed in classrooms. Among all the dynamics that revealed signs of professional learning, we point out at (I) the child's register, which makes it possible to have an investigation of his/her own practice; (II) the theoretical interpretations that give the teaching practice sense; (III) the kindergarten games and plays allowing a curricular dimension for mathematics in kindergarten; and (IV) the appropriation and (re)signification of "letting speak" by the teachers who worked with the dynamics.
investigating one's own practice; games and plays; register