Because the author and his colleagues at the Center for Leadership and Learning Communities believe that instructional coaching is one of the most exciting developments in education in a long time, they have examined the questions this new strategy has raised for education leaders: Should coaching replace some traditional forms of teacher professional development? If not, how can coaching be integrated with other forms of professional development in the lives of teachers? How much group professional development is needed along with coaching? They have concluded that the relationship between coaching and group professional development should not be thought of in "either-or" terms, but rather "both-and." (Contains 2 figures.)