The authors analyze a particular pedagogy for learning to interact productively with students and subject matter, which they call “rehearsal.” Their goal is to specify a way in which teacher educators (TEs) and novice teachers (NTs) can interact around teaching that is both embedded in practice and amenable to analysis. The results of the quantitative analyses characterize how typical rehearsals were structured and what was worked on. Furthermore, the results show how NTs and TEs worked together to enable novices to study principled practice through qualitative analyses of a particularly salient aspect of ambitious teaching, namely, eliciting and responding to students’ performance.