Teacher Moments (Media Interactive Case Studies) presents novice teachers with short classroom scenarios and gives them spaces to practice their responses to students in the moment. Early scenarios have focused on skills related to motivating students, encouraging NGSS inquiry practice and addressing misconceptions. Research is focused on investigating the affordances of different representations and approximations, how that supports teacher learning, and how elements of instructional design like reflection and peer feedback affect teacher learning. We’ll also aim to develop a design framework that yields design principles for simulations and rehearsals from this work.