Abstract
In this paper I argue that teachers of the twenty-fIrst century need radically reformed
professional development experiences if they are to teach in inquiry-based ways consistent
with views of learning mathematics as an active, social and constructive process. By
carrying out a comparative poststructuralist analysis of two teaching/learning interactions
[from a paper authored by Manouchehri and Goodman (2000)], I go beyond the extant
argument about the importance of teachers' mathematical and pedagogical knowledge and
new images of teaching to suggest that additional factors may need to be considered as part
of the professional development process. From a poststructuralist perspective I argue that
the teacher's unspoken but influential knowing about learners and learning must also be
considered and addressed as this impacts heavily, and often conservatively, on practice.
Though contentious, the implications for professional development are contemplated.