ABSTRACT
We offered a new definition which includes social activity at work, leisure and in relationships, and coordination over joint activities, communication and social interaction. This extends cooperation to include encounters and relationships where the goal and end-product is simply the relationship itself, or is the joint activity, as in making music. It also includes communication and interaction, where the cooperation consists of coordination, in the service of other goals. There is a sense in which all social behaviour is cooperative, since in the most minimal case it takes two to send and receive a message; however, some situations, relationships and cultures are more cooperative than others.
