The book "Modelling Autonomic Communications Environments" offers a comprehensive collection of contributions presented during the 4th IEEE International Workshop on Modeling Autonomic Communications Environments (MACE 2009). This workshop, held in the culturally rich city of Venice, is part of Manweek, an international week focused on the management of networks and services. Since its inception in 2006, MACE has evolved into a platform that brings together professionals and researchers to discuss innovative ideas and developments in the field of autonomic communication. The contributions in this volume reflect the dynamic and exploratory nature of the workshop, which provides space for new, often unfinished concepts that stimulate intense discussions. The editors, John C. Strassner and Yacine M. Ghamri-Doudane, have made it their mission to preserve this atmosphere of exploration and exchange, which is of great importance to the scientific community.