Abstract
Mathematics education reforms in numeracy focus on children’s thinking and problem
solving strategies. Cognitively Guided Instruction (CGI), developed by researchers at the
University of Wisconsin, provides a model for both mathematics pedagogy and the
professional development of teachers. In the same way that children’s learning of
mathematics in the classroom builds on their previous understanding, the activities of CGI
workshops are deigned to build on the previous understanding of the participant teachers.
This paper discusses the challenges and changes to participants, both teachers and teacher
educators, of a CGI-based professional development numeracy programme.