International teaching assistants face challenges in learning the norms for teaching in American universities. In order to address this learning curve this article describes a qualitative study of twenty international teaching assistants that examined how these participants viewed observations as part of their professional development. The study explored the noticing practices of international teaching assistants who participated in an initial interview, followed by a classroom observation so that the ITAs could notice their own teaching practices in the classroom. After examining the ITAs' noticing of events during observations, the article will conclude with general recommendations for effective use of observations as part of the training of international instructors.