This article aims to contribute to the theory of mathematics instruction by highlighting and analysing Leen Streefland's work as a teacher in a primary school. Core ideas of Streefland's are discussed as part of a recent wave of educational innovations using the idea of learning communities. I present a case study of a lesson co-taught by…

In a multiunit school, teachers are organized into relatively autonomous groups. Each group has a unit leader responsible for management and coordination of unit activities, who serves as a linkage to the principal. Decisionmaking functions and the influence system are lodged in the group, thus diffusing what would be the principal's authority in…