Lesson theme: Acids and alkalis; their properties and differences. See www.lessonsinobservation.com/ for more details and to purchase. The full lesson is available on Lessons in Observation: Special Education Lower School. All of our DVDs include pause points with prompt questions written by inspectors trained in the latest Ofsted framework. Supporting materials are provided which include lesson plans, pupil work, teacher and pupil reflections and guidance for using as a CPD resource.