Abstract
From our accumulated experience as a Science Didactics Group, we reflect on the tensions and potentialities that unfold in the construction of initial and in-service teacher training spaces, oriented from Freirean-based popular education towards the transformation of practices in Natural Sciences, Environmental and Health Education. Based on our experiences, we identified an axis of tensions and potential linked to the transformation of the reading of reality, of practice itself and of reality itself; and another axis linked to the possibility of bringing knowledge from different sources into teacher training. From this analysis, we recovered theoretical categories and situations of practice related to conditions that favor changes, real participation, knowledge and experiences dialogues and crossings between popular education, theory and practice of teacher training.