Institutions need effective and efficient methods of professional development for preparing graduate students to teach. These skills are important both for their immediate roles as teaching assistants (TAs) and for their eventual roles in the professoriate. An iterative process model from instructional design can function as a cognitive organizational framework for the development of teaching expertise. It facilitates expertise by supporting TAs in connecting new and existing knowledge about teaching and learning in meaningful ways that reflect the cognitive processes of expert teachers. Thus, it can support both the current and future development of teaching expertise and facilitate the application of knowledge in the form of teaching strategies.