Current work to identify the core teaching practices that should be included in teacher education curriculum is a part of a long-standing tradition of reform in American teacher education. This article situates the proposals of Hiebert and Morris and the contemporary work to which it is linked within this historical tradition and identifies several issues that need to be addressed by this current work. These include the task of developing a system that unlike performance-based systems in the past is evidence-based, manageable, and sustainable, and that does not ignore important aspects of good teaching. (Contains 2 notes.)