Bernad Y Alvarez De Eulate, Maximiliano Keywords: Europe | Transfrontier co-operation | Mots clefs: Europe | Coopération transfrontalière | ABSTRACT Maximiliano Bernad y Alvarez de Eulate, Professor at the University of Saragossa, proposes to draw the attention of the reader to the problems and the achievements of regional and local cross-border cooperation, to show how in practice this is characterized by a very important degree of spontaneousness, diversity and flexibility, and to highlight certain trends. Profes…