Abstract
The purpose of this study was to identify the testable beliefs of three secondary
mathematics teachers, though for reasons of space only two are reported here. The teachers
were involved in a collaborative teacher-led professional development program. The aims
of this program were to enable the teachers to reflect on their practice, investigate issues of
concern and by collaboration alter their instructional practice. The teachers’ beliefs were
identified and several inconsistencies highlighted. This study was able to identify testable
beliefs for each teacher and a further study intends to investigate whether these
inconsistencies once recognised by the teachers can be tested through teacher-led
professional development.