Employers have long turned to behavioural science for guidance on making their organizations more effective. The author of this text believes union leaders should also take advantage of discoveries in this field and offers an account of how they can do so. Much of the behavioural science research relevant to unions relies on complex statistical analyses and is disseminated through scholarly journals. This text aims to make the findings of behavioural science accessible to those committed to building a stronger labour movement. It describes behavioural science's understanding of such topics as organizational commitment and member participation and suggests how this knowledge can best be applied to unions. The book features examples of how unions and their leaders have benefited from putting the principles of behavioural science into practice.