In language teacher education, it is important to fill the gap between theory and practice. In recent years, reflective teaching being suggested to fill this gap has found a crucial place in academic studies. It is generally agreed that reflection helps both pre-service and in-service teachers to develop professionally by presenting a chance of practicing and reflecting on the practice. However, using reflection in teacher education seems to be difficult for both teachers and teacher trainers as the question how to reflect has not been answered in a satisfactory way yet. Hence, this book suggests using a different and new way which is first announced by ECML (European Centre for Modern Languages). This way is the EPOSTL (European Portfolio for Student Teachers of Languages) that helps prospective teachers reflect on both their linguistic and didactic skills. This book sheds light on the question if the EPOSTL is really useful for reflection in practice and what the challenges of using it in teacher education are.