'This is a must read for planners worldwide. The Third Lens dissects the complex trade-offs between the properties of strategic landscape and time frame at stake to help you to see what you did not see before and to practice possibilities around you.' Michael S. Loescher, Author of Proteus ...Insights from 2020, President, The Copernicus Group Inc., Executive Director, The Copernicus Institute, USA 'Multi-ontology sense-making, with its explicit recognition that there are differing types of system in which different causal assumptions apply offers a radically new way of approaching management in an uncertain world. Mika Aaltonen's book is a vital contribution to this field. I strongly recommend this book.' Dave Snowden, Cognitive Edge Pte Ltd, UK 'There is no doubt that this book will become a cornerstone for multi-ontology sense-making. By reading this book, I realised how powerful such an approach could be.' Patrick L. Hetzel, University Pantheon-Assas, Paris, France 'The book is well-organized, full of essential contexts, and a worthwhile read.' International Journal of Operations & Production Management