As teachers learn new pedagogical strategies, they crave explicit demonstrations that show them how the new strategies will work with their students in their classrooms. Successful instructional coaches, therefore, understand the importance of modeling lessons to help teachers develop a vision of effective instruction. The author, an experienced coach, provides practical tips on using both live and videotaped demonstration lessons to help teachers examine and improve their practice. For example, demonstration lessons should have a clear purpose and should be connected to ongoing, collaborative professional development. Observing teachers should be actively engaged in the lesson--for example, by taking notes on specific students, or by jumping in at planned points to take over part of the instruction. Used effectively, says the author, demonstration lessons are a crucial part of coaching that can help schools build a common vision of effective instruction.