Abstract
Linked research and development forms the central pillar of the 5-year Wits Maths Connect
Secondary Project in South Africa. Our empirical data emphasised the need for teaching
that mediates towards mathematics viewed as a network of scientific concepts, and the
development of the notion of ‘mathematical discourse in instruction’ (MDI), as an analytic
tool and discursive resource for working on research and professional development. This
paper describes and reflects on MDI, its emergence in a particular education context, and
what this discursive resource offers more generally as it works across different discourses
and practices.