In this article, the authors argue for making practice the core of teachers' professional preparation. They set the argument for teaching practice against the contemporary backdrop of a teacher education curriculum that is often centered not on the tasks and activities of teaching but on beliefs and knowledge, on orientations and commitments, and a policy environment preoccupied with recruitment and retention. The authors caution that the bias against detailed professional training that often pervades common views of teaching as idiosyncratic and independently creative impedes the improvement of teachers' preparation for the work of teaching. They offer examples of what might be involved in teaching practice and conclude with a discussion of challenges of and resources for the enterprise. (Contains 2 tables, 4 figures, and 6 notes.)