This research study investigates how pre-service teachers integrate statistical content, students' thinking, and pedagogy as they examine how 11- to 12-year olds develop mathematically. The findings provide insights into: a) how pre-service teachers identify some of the difficulties that students commonly have, and b) what pedagogical approaches pre-service teachers use to address students' difficulties and enhance students' learning. These findings have implications for the design and delivery of professional development that improves teachers' knowledge, understanding, and skills in teaching statistics.