The Diploma in TESOL at the University of Brighton is a postgraduate professional qualification for experienced English language teachers wanting to develop their practice and understanding of English Language Teaching (ELT). The Diploma combines assessed teaching practice with academic study into aspects of language teaching and learning such as ELT methodology, use of technologies, materials, language analysis and exploration and second language acquisition. A key component of the Diploma in TESOL is the development of teaching practitioners' reflective ability. Our aim is to help teachers deepen their understanding about their own professional practice and this is integrated throughout the course.