Book excerpt: There has been considerable debate on sport psychology about the status and the function of cognition and action in sport. This debate is very relevant since there was a refinement of the different positions, and there were several attempts to integrate apparently contrasting perspectives. A main goal of this book is to put the links between cognition, perception and action into the discussion both oriented towards theory and practice, and thus, cast a new look on cognition and action in sport. The book is organised in three sections. Section I discusses the organisation of action attending to its dynamics and complexity. It shows how multiple levels of complexity are involved in performance and learning. Section II discusses not only what is knowledge, but also how athletes use it during performance. Section III presents different perspectives about judgement and decision-making as well as applications to training.