Three Horizons is a foresight tool, providing a simple framework to work with what we know at the same time as engaging creatively with what we do not know.This book outlines the Three Horizons framework and the practices it supports, and includes case studies of its effective application. I highly recommend this body of work to anyone wishing to work well with the different voices of continuity and change when wrestling with problems of daunting complexity. Other Three Horizons resources can be found at The University of the Third Horizon.