ABSTRACT
We draw on Engeström’s (2011a) formative intervention approach to bring together mentor teachers and university supervisors to construct a tool for structuring observations and mentoring student teachers. Data include videos and transcripts from seven meetings where participants discussed mentoring and viewed video records of teaching practice to articulate problems and solutions. We examine how video afforded opportunities for participants to precisely describe problems of practice, to develop a shared vision and language of ambitious instruction, and to collectively construct frameworks to guide their work. Findings have implications for design of professional development for teacher educators and programs of teacher preparation.