What types of talk promote teachers' professional growth? In the following vignettes, 4th-grade teachers and instructional leaders examine student work and observe classroom instruction. These learning designs encourage teachers to talk in ways that develop a shared understanding of teaching, which is instrumental to their professional growth (Lampert et al., 2013). A close look at these vignettes shows how instructional leaders establish schoolwide professional communities in which teachers and leaders continually converse about their practice.