One of the main goals of the Teacher Learning and Leadership Program (TLLP) is "to facilitate knowledge exchange" for the sharing and sustainability of innovative and effective practices. Knowledge exchange was evident for teachers within their own schools, nearby schools, and their own school district. In most instances, other teachers were the audience for knowledge sharing activities. The primary knowledge exchange method occurred through the district's Balanced Math (BM) professional development workshops and sessions for teachers from the participating schools. This chapter provides two Provincial Knowledge Exchange (PKE) case studies as examples of knowledge exchange. The PKE provides an opportunity to research approaches to knowledge exchange, sharing of learning and practices, and prospects for wider impact and longer-term sustainability. The case studies examine the experience and impact of TLLP projects that developed into PKE projects with the goals of wider sharing of professional learning for increased impact and sustainability of improvements in professional practices and students' learning.