Reflective discourse analysis of pre-service teachers in a context of pedagogical innovation in geometry. The reflective narratives of three pre-service teachers are analysed from the perspective of discourse analysis and reflection on practice, applied to the acquisition of geometric competences and the role of dynamic geometry. In the context of the master's degree for future secondary school teachers in mathematics and a pedagogical innovation project, where two of the authors gave training sessions entitled 'automated visualization' and 'technological mediation', the pre-service teachers were given a questionnaire in which they were asked to return to what they had learned, questioning the contribution of their training to their future teaching practice. In the narratives collected, three degrees of reflection can be found, ranging from the naivety of certain assessments to professional initiatives and purely mathematical perspectives. The didactical and mathematical consequences of this analysis are presented and discussed, highlighting, in particular, the intrinsic difficulty of ensuring that relevant, but potentially disruptive, ideas of pedagogical innovation are conveyed to pre-service teachers against the weight of tradition and personal beliefs in mathematics teaching.