The European Framework for CLIL Teacher Education (EFCT – http://clil-cd.ecml.at) is a conceptual tool for guiding the professional development of CLIL teachers. CLIL (Content and Language Integrated Learning) is a dual-focused approach in which an additional language is used for the learning and teaching of both content and language. The framework provides a set of principles and ideas for designing CLIL professional curricula. CLIL programmes differ widely from country to country in their organisation, content, intensity and choice of languages, and there are corresponding differences in how teacher education providers design and implement teacher training and development programmes. The EFCT aims to serve as a transnational conceptual tool for supporting the development of theoretically-sound educational practice in CLIL contexts. It is not intended as a prescriptive template.