Studying one's profession, especially when done in community with others, where the learning is richer and deeper, has not been the norm in the education community. Educators typically have been physically isolated from each other because of the structure of school facilities and the schedules that dominate the school day. This physical isolation has resulted in mental isolation as well when colleagues have little interaction. However, knowledge is most fruitfully constructed in a social context. Providing the opportunities--the structures and schedules--for school-based educators to come together to learn in community is an important challenge for the next decade of teachers' professional learning. In the future, collective learning will be the hallmark of the school staff, and schools will have created the conditions that support a community of professionals in their learning. These conditions take two forms: (1) the structural or physical; and (2) the human or relational. Education systems of the future will have understood that the most significant factors determining whether students learn well are the competence, caring, and commitment of teachers and administrators.