Our fundamental human need to belong is a force so strong that it exerts a powerful influence over our behaviour. We will often act in ways that contradict our personal values in order to secure membership, reclaim membership or prevent exclusion from a group. This need to belong is a legacy of our evolutionary past. Survival was far greater for those who lived and worked together in groups. However, our ability to interact with others successfully for the common good of the group remains one of our greatest challenges.