Lesson Study is a structured professional development process in which teachers systematically examine their practice and work together to improve it. Teachers work collaboratively on a small number of "study lessons", in a plan-teach-observe-critique cycle. Teachers select an overarching goal and related research question that they want to explore to provide focus and direction to this work. For Test and Learn it would be possible to consider specifying particular lesson foci catered for teaching approaches e.g. differentiation, content, year group, ability group, or improving the quality/depth of teaching.