We all need to co-operate to some degree. According to the eminent sociologist Richard Sennett, author of a recent book on the topic, complex co-operation is a craft. Listen to him discussing co-operation with Nigel Warburton on this episode of the Social Science Bites podcast. Social Science Bites is made in association with SAGE. A transcript of this interview is available from www.socialsciencebites.com.