“…Further validation was established through member checking by having Mary review a draft report of the results and interpretations. In order to ensure a potential transferability beyond the case, a situated generalizability was applied based on practice-based evidence (Simons, Kushner, Jones, & James, 2003 During the interviews, Mary often referred to the rules of participation in mathematical practices within the classroom. The rules included listening to the teacher, taking notes, attendance, proper ways of asking questions, practicing (key) questions and exercises determined as imperatives for doing and learning mathematics within the classroom.…”