This document discusses the importance of collaborative professional learning among teachers. It defines collaboration as joint planning, decision making, and problem solving with common goals and high levels of trust. The benefits of collaboration include improved teacher learning and whole-school improvement. Effective collaboration is data-driven, focused on improving teaching practice and student outcomes. The school leader plays a key role in developing a collaborative culture through building trust, supporting collaboration time, and distributed leadership. Common collaborative approaches used in schools include peer observation, instructional coaching, professional learning communities, and learning walks. A case study example demonstrates how a collaborative inquiry approach improved student spelling at one school.