1. Department of Research and Development, University of Teacher Education of the Grisons, PHGR, Chur, Switzerland
2. Center for School Improvement and School Effectiveness Research, Johannes Gutenberg University Mainz, Mainz, Germany
3. Institute of Education, University of Zurich, Zurich, Switzerland
4. Institute of School Education and Educational Research, University of Rostock, Rostock, Germany
5. Institute of Education Science, University of Heidelberg, Heidelberg Germany
6. Institute of instructional and school development (IUS), University of Klagenfurt, Klagenfurt, Austria