This volume contains the 43 papers written by close collaboratorsand friends of UgoMontanariincelebrationofhis65thbirthday.Insomesense,thevolumeisa re?ection, with gratitude and admiration, on Ugo's highly creative, remarkably fruitful and intellectually generous life, which is thriving as strongly as ever. It provides a snapshot of the manifold research ideas that have been deeply in?uenced by Ugo's work. In a sense the book gives a vantage point from which to foresee further developments to come: by Ugo himself, and by many other people encouraged and stimulated by his friendship and example. The volume consists of seven sections, six of which are dedicated to the main research areas to which Ugo has contributed. Each of these six sections starts with a contribution by one of Ugo's closer collaborators providing an account of Ugo's contribution to the area and brie?y describing the papers in the section. The six scienti?c sections and the respective editors are the following: - Graph Transformation (Andrea Corradini) - Constraint and Logic Programming (Francesca Rossi) - Software Engineering (Stefania Gnesi) - Concurrency (Roberto Gorrieri) - Models of Computation (Roberto Bruni and Vladimiro Sassone) - Software Veri?
cation (Gian-Luigi Ferrari) The ?nal section,edited by Fabio Gadducci,contains somelaudatio or memories of working experiences with Ugo, as well as three more technical contributions.