This document provides an overview of a framework for the professional development of CLIL (Content and Language Integrated Learning) teachers. It discusses the importance of curriculum development for CLIL teacher training. The framework aims to provide principles for designing CLIL professional development curricula and serve as a tool for reflection. It identifies the major challenge of CLIL as its integrative nature, as teachers must be prepared to teach both a content subject and language in an integrated manner. The document also provides definitions for key terms used in the framework.