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.Improving educational outcomes in the United States is a challenging problem, one that preoccupies contemporary reformers and critics alike. With a system of schooling that has never delivered high quality education to all students, policy makers and educational leaders are calling for more complex and ambitious goals to prepare youth for the demands of the 21st century. Visions of better schooling include innovative uses of technology, a much greater emphasis on collaborative work, integrated and problembased curricula, and higher expectations for students. Too often minimized is what such changes imply for the interactive work of teaching and learning. And, given that there are almost 4 million teachers in the United States, preparing teachers to meet these demands is a massive undertaking. Nonetheless, improvements in student learning depend on substantial, large-scale changes in how we prepare and support teachers.Agreement is widespread that teachers are key to student learning, and efforts to improve teacher quality have proliferated. Most initiatives, however, have focused on teacher recruitment and retention and on developing new pathways to teaching. In this article, we argue that such initiatives are insufficient without fundamental renovations to the curriculum of professional education for teachers, wherever and through whatever pathway it occurs. We claim that practice must be at the core of teachers' preparation and that this entails close and detailed attention to the work of teaching and the development of ways to train people to do that work effectively, with direct attention to fostering equitably the educational opportunities for which schools are responsible.By "work of teaching," we mean the core tasks that teachers must execute to help pupils learn. These include activities carried on both inside and beyond the classroom, such as leading a discussion of solutions to a mathematics problem, probing students' answers, reviewing material for a science test, listening to and assessing students' oral reading, explaining an interpretation of a poem, talking with parents, evaluating students' papers, planning, and creating and maintaining an orderly and supportive environment for learning. The work of teaching inclu...