This volume comes at a critical juncture, as global commitments transition from the Millennium Development Goals to Sustainable Development Goals and the wider post-2015 development agenda is being discussed and debated. In these discussions, children and youth have been recognized as one of the nine major groups of civil society whose participation in decision making is essential for achieving sustainable development. There is also a concomitant need for action-innovative, evidence-based approaches to addressing entrenched global challenges or 'wicked problems' and engaging youth in those efforts.