'Complexity theory is the wave of the future in planning thought. It helps us to see how things really work in cities and regions and provides a basis for rethinking the practice of planning for the 21st century. This collection of articles, each of which explores complexity in planning from a different perspective, advances the journey toward more insightful theory and more effective practice.' Judith Innes, University of California, Berkeley, USA, co-author of Planning with Complexity: An Introduction to Collaborative Rationality for the 21st Century ’Complex adaptive systems are the stuff of life and culture. But it is a long way from such general statements to how things play out on the ground. This book provides the best guide yet to planning for that complexity.’ Nigel Thrift, University of Warwick, UK 'Important reading for anyone interested in complexity theory, planning, and city systems.' Journal of Regional Science