Introduction to the work of TWG19 : Mathematics teaching and teacher practice(s)

This introduction for TWG19 offers a brief history of the group and describes past challenges the group has experienced when discussing papers-seeing papers as related and as contributing to a common effort. These challenges led us as TWG19 team leaders to develop three initiatives to support communication among researchers who work in different contexts with different purposes. The initiatives are presented and used to discuss the papers. We conclude with implications for the future.publishedVersio