The last issue of AccountAbility Forum takes as its theme the idea of accountable leadership. AccountAbility believes that we are in the midst of a fundamental transition away from the vital issues that confronted the 20th-century leaders. Challenges such as climate change, global poverty, water stress, peace and security, and globalising societies' health and education problems are diffuse, hard to define simply, and international in nature. Few obvious courses of action will present themselves, and solutions will demand extraordinary imagination and collaborative skills.