We are all experienced negotiators. We face challenging and complex problems of persuasion and influence on a daily basis. We buy and sell. We manage workers and work for managers. We deal with friends, family, colleagues, merchants, organisations and institutions all the time. Yet building agreement among people who often do not share the same interests, perceptions and values is challenging and sometimes elusive. What are some of the reasons for falling short of success – and how can we address them?