<p>This working session seeks to address questions that emerged from the Discussion Group ‘Videos in Teacher Professional Development’ at the 13th International Congress on Mathematical Education (Leong, Ho & Evans, ICME13, 24-31 July 2016, Hamburg). The ICME13 Discussion Group considered experiences from a number of international projects using videos to observe teacher practice for professional development (PD) purposes including:</p> <p>The use of recorded lectures for PD in undergraduate mathematics at the University of Auckland, a collaborative project between research mathematicians and mathematics educators (Barton, Oates, Paterson & Thomas, 2015), based on the theoretical Resources, Orientations and Goals (ROG’s) framework developed by Schoenfeld (2010;  A cross-institutional study using videos to aid tutor reflection by King & Lonsdale in Australia (First Year in Maths project, King & Cattlin, 2017);</p> <p>The use of a video databank, based on the Japanese Lesson-Study approach, with pre-service teachers in Singapore (Ho, Leong & Ho, 2015);</p> <p>Using the Mathematical Quality of Instruction (MQI) observational tool with elementary teachers in the Pacific Northwest and New England in the USA, as a lens to discuss mathematics instruction (Hill et al., 2012); Gaps in PD provision identified by the TEMPEST project in Australia, which examines the extent and quality of PD opportunities for mathematics teachers (Reaburn, Kilpatrick, Fraser, Beswick, & Muir, 2016)</p>