This fourth edition of Building a Better World offers a comprehensive introductory overview of Canada's labour movement. The book explores why workers form unions; assesses their organization and democratic potential; examines issues related to collective bargaining, grievances and strike activity; charts the historical development of labour unions; and describes the gains unions have achieved for their members and all working people. This new and expanded edition also analyzes the challenges facing today's labour movement as a result of COVID-19 and the strategies being developed to overcome them.