This work provides a careful selection of extended contributions presented at the 2014 ECCS conference and its satellite meetings, reflecting the scope and diversity of both fundamental and applied research areas in the field. The ECCS meeting, held under the patronage of the Complex Systems Society, is an annual event that has become the leading European conference devoted to complexity science. It presents cutting-edge research and offers a unique opportunity to study novel scientific approaches in a multitude of application areas.  ECCS14, the eleventh annual event, took place in Lucca, Italy. It gathered some 650 scholars representing a wide range of topics related to complex systems research, with emphasis on interdisciplinary approaches. The editors are leading specialists in the area. The book is of great interest to scientists, researchers and graduate students in complexity, complex systems and networks.