I have also commented on individual versus collective learning on the part of the teacher, and on the role of reflection and the knowledgeable other. Although, as mentioned above, the studies are grounded in different learning contexts, collective actions and reflection on one’s own practice and knowledge are given prominence in the chapters making up this section. Various roles are available for the researcher/instructor, from that focusing particularly on evaluating the student teachers’ learning to promoting reflection amongst student teachers and teachers, including that of knowledgeable other encouraging discussion and reflection by teachers on their mathematics knowledge and the practice of teaching.