Teacher education programs typically teach novices about one part of teaching at a time. We might offer courses on different topics--cultural foundations, learning theory, or classroom management--or we may parse teaching practice itself into a set of discrete techniques, such as core teaching practices, that can be taught individually. Missing from our courses is attention to the ultimate purpose of these discrete parts--how specific concepts can help teachers achieve their goals, or how specific procedures can help them achieve their goals. Because we are now shifting from a focus on bodies of knowledge to a focus on depictions of practice, this article examines our efforts to parse teaching practice into lists of discrete procedures. It argues that we need to pay less attention to the visible behaviors of teaching and more attention to the purposes that are served by those behaviors. As a way to begin a conversation about parsing teachers' purposes, I offer a proposal for conceptualizing teaching as a practice that entails five persistent problems, each of which presents a difficult challenge to teachers, and all of which compete for teachers' attention. Viewed in this way, the role of teacher education is not to offer solutions to these problems, but instead to help novices learn to analyze these problems and to evaluate alternative courses of action for how well they address these problems.