Highly successful, widely trusted and globally applauded, international civil society organisations (ICSOs) such as Oxfam, Greenpeace and Amnesty International are major players on the global stage. However, fundamental change in the outside world threatens their role and future existence: Shrinking space for civic participation hinders their work in many countries; climate change, persistent poverty and growing inequality make it harder for them to achieve their missions; and the rise of the internet disrupts their business models. At the same time ICSOs are needed more than ever. Effective civil society organisations have to help charting the way towards a sustainable, fair and equitable world, setting positive examples and bringing citizens on board. The book describes the key features of effective global civil society organisations and charts the journey today's ICSOs have to undertake to turn themselves into successful drivers of the transition.