"Teachers Teaching Teachers" ("T3") focuses on coaches' roles in the professional development of teachers. Each issue also explores the challenges and rewards that teacher leaders encounter. This issue includes: (1) Districts Harness the Expertise of Classroom Teachers (Valerie von Frank); (2) Tool: Measuring Collaborative Norms; (3) Lessons from a Coach: We Become a Teacher's Inner Voice; (4) Focus on NSDC's Standards: Leaders Come from All Corners (Joellen Killion); and (5) Research Brief: Looking to Improve Teacher Teams? (Carla McClure). (Individual articles contain references.) [For Volume 4, Number 8 of "Teachers Teaching Teachers," see ED507662.]