Cooperation is both a challenge and a necessity for modern public administration authorities. The increasing differentiation in public administration requires increasing cooperation to create synergy. Nevertheless, cooperation faces many difficulties due to different legal systems or administrative cultures. Furthermore, cross-border administrative cooperation has to meet challenges set by various national and subnational legal systems. Cooperation between regional administrations is inevitable if cross-border regions want to create a common space for their citizens. This volume examines cross-border administrative cooperation, especially illustrated by the example of the European region that encompasses Tyrol, South Tyrol and Trentino.