The Adaptation Primers are a four-part manual that provides basic information on adaptation, one of the most complex challenges facing decision-makers in this first half of the 21st century. Primer Two focusses on managing risk and understanding the role played in decision-making by uncertainty. Primer Two outlines the need to change what we do, to mitigate and to adapt. This primer provides direction for those seeking a better future, incorporating existing instruments and tools with emerging principles and processes for guiding change. Perhaps the most important component of the Primers is the reference material provided for each Chapter. The resources cited are intended to deepen understanding, share experience and, ultimately, to provide inspiration for innovative approaches to policy, planning, and design. It is hoped that the Primers can aid decision-makers as they advocate the need for change and the positive potential of change.