An important part of teaching probability is teachers interacting with students about probability.Most of these interactions do not occur anywhere else but inside the classroom so that is where weshould research teacher knowledge for future development of teacher training and professionaldevelopment. To accomplish this I propose a research methodology founded on the theoreticalassumptions of symbolic interactionism combined with a grounded theory approach. The purposeof this paper is to outline such a research methodology that focuses on teaching as classroominteraction between teachers and students. The discussion aims to emphasize the possibilities bythis way of studying teachers’ knowledge for teaching probability and refine the methodologicalconstruct. Examples used are from lessons where two teachers work with unknown sample spacesand interact with students regarding chance, variation and the importance of sampling.