The chapters of this book have illustrated how interpersonal coordination tendencies are a prominent feature of the functioning of collective systems in many different walks of life, including work, education, military and sport contexts. Different chapters have comprehensively shown how interactive phenomena emerge in everyday actions, sometimes when people are unaware of them, such as when negotiating a crowded street, bus or train, walking on a street while talking with a friend, or driving in a traffic jam. Other contributions to this book have revealed how fundamental behaviours in sport performance, whether in individual contexts like sprinting in athletics, in team sports and in creative physical activities like dance, ice skating and synchronized swimming, involve the co-adaptation of behaviours that are constrained, among other things, by the need to continually interact with other athletes.