The NICLAS Summer School was created as an innovative tool for the teaching of constitutional law in its various international contexts. NICLAS offered to the participants a complementary interactive, multicultiral, and pluri-discplinary platform for the exchange of research, teaching and learning experience on recent changes and challenges by the internationalisation of constitutional law. The summer school took place from 2007 to 2012, each year in the first half of July, as an ERASMUS Intensive Programme at the Universities of Vienna, CEU Budapest, EUI Florence and PEU Bratislava and involved 13 more European partner universities. This volume is a tour d’horizon through the different topics taught and discussed during six years of NICLAS. The articles are written by summer school participants at various academic levels (postgraduate-students, teachers, researchers, practitioners). They reflect the various topics and methodologies of the summer school and can also serve as examples for teaching materials for other educational initiatives dealing with international constitutional law.