This article describes a model for incorporating lesson study into the student teaching placement and reports on the success of the implementation of such a model with student teachers and their cooperating teachers (CTs). Student teachers had the opportunity to discuss many important ideas with each other and their CTs, including "big ideas" of mathematics, and the anticipation of student questions and possible responses. Student teachers also had a built-in opportunity for peer observation on a regular basis and the opportunity to collaborate with their peers. Certain important aspects of lesson study were not present in this implementation: the teachers involved did not discuss the gaps in their own knowledge with the goal of improving their own mathematical understanding, they did not refer outside sources for ideas for the lessons, and they did not have an overarching affective goal for students. Suggestions are made for teacher preparation in light of these findings.