Mike Ashby is one of the world's foremost authorities on materials selection. He is sole or lead author of several of Elsevier's top selling engineering textbooks, including Materials and Design: The Art and Science of Material Selection in Product Design, Materials Selection in Mechanical Design, Materials and the Environment, Materials and Sustainable Development, and Materials: Engineering, Science, Processing and Design. He is also co-author of the books Engineering Materials 1&2, and Nanomaterials, Nanotechnologies and Design.Hugh Shercliff is a Senior Lecturer in Materials in the Department of Engineering at the University of Cambridge. He is a co-author of Michael Ashby's Materials, Third Edition (Butterworth-Heinemann, 2013), and a contributor on aluMATTER, an e-learning website for engineers and researchers sponsored by the European Aluminium Association.David Cebon is Professor of Mechanical Engineering at Cambridge University in the UK.