This work presents the case of a high school Biology teacher that had as investigative focus her own educational practice and analyzed the terms that allowed the research to be joined to teaching. The teacher 's practice was collected with audiovisual recordings and a personal logbook. The research and teaching developments could advance thanks to the effort and persistent of the researcher in using the research methodology,was also able to incorporate objective aspects as well as subjective ones with regard to educational practice.
Teacher-researcher; Subjectivity; Research methodology