This international, peer-reviewed journal aims to advance knowledge in the growing and strongly interdisciplinary area of Interaction Studies in biological and artificial systems. Understanding social behaviour and communication in biological and artificial systems requires knowledge of evolutionary, developmental and neurobiological aspects of social behaviour and communication; the embodied nature of interactions; origins and characteristics of social and narrative intelligence; perception, action and communication in the context of dynamic and social environments; social learning, adaptation and imitation; social behaviour in human-machine interactions; the nature of empathic understanding, behaviour and intention reading; minimal requirements and systems exhibiting social behaviour; the role of cultural factors in shaping social behaviour and communication in biological or artificial societies.