1. Department of Engineering, Institute for Manufacturing, University of Cambridge CB3 0FS, Cambridge U.K. and also with the Department of Management, Technology and Economics, ETH Zurich 8092, Zurich Switzerland. (e-mail: who@ethz.ch).
2. Department of Engineering, Institute for Manufacturing, University of Cambridge CB3 0FS, Cambridge U.K. (e-mail: nt377@cam.ac.uk).
3. Department of Engineering, Institute for Manufacturing, University of Cambridge CB3 0FS, Cambridge U.K., and also with the Valuechain WA4 4FS, Cheshire U.K. (e-mail: tbd24@cam.ac.uk).
4. Brunel Business School, Brunel University London UB8 3PH, Uxbridge U.K. (e-mail: manoj.dora@brunel.ac.uk).
5. Department of Engineering, Institute for Manufacturing, University of Cambridge CB3 0FS, Cambridge U.K. (e-mail: mk501@cam.ac.uk).