Internationalization poses a challenge to constitutional law setting out the fundamental principles according to which a state is governed. Even friendly states do not always agree on the meaning of key terms as democracy and the rule of law. Hence it is essential to build bridges. This is the goal of the pioneer project „Handbuch des Verfassungsrechts – a Transnational Perspective on German Constitutional Law“. Prof. Dr. Johannes Masing, co-initiator and German Federal Constitutional Court Justice talks about the ambitious undertaking to promote a cross-border dialogue among legal systems.