This book reports a systematic synthesis of research on teachers' use of adjustments to support students with special educational needs who are currently in their mainstream classrooms. It presents a comprehensive analysis and synthesis of both quantitative and qualitative data, including studies involving observation, artefact examination, interviews, and surveys. It offers a holistic understanding of the current practices used by teachers to fulfil the intent of international inclusive education policy, and support the inclusion of students with a range of needs within the context of mainstream classrooms and programmes. This book also offers a range of recommendations for improving practice.