The second volume on empirical classroom research in German as a second and foreign language focusses on practice in the classroom and in teacher professionalization. It presents studies of effectiveness regarding the planning, implementation and evaluation of didactic approaches. At the center of attention are empirical studies on immersion, differentiation, learner-autonomy, project-based learning and cultural reflexivity. The individual studies consequently emphasize the fostering of multilingual, communicative, socio-cultural, interactional and reflexive competencies of the different participants involved in the language learning process. A variety of explorative, descriptive and explanative approaches to data collection and data analysis is employed and critically discussed.