1. Faculty of Science, Technology, Engineering & Mathematics, The Open University, Milton Keynes MK7 6AA, UK
2. Division of Product Development, Department of Industrial and Materials Science, Chalmers University of Technology, 412 96 Gothenburg, Sweden
3. Department of Statistics, Ludwig-Maximilians Universität München, Geschwister-Scholl-Platz 1, 80539 Munich, Germany
4. Department of Philosophy, University of Vienna, Universitätsstraße 7 (NIG), 1010 Wien, Austria
5. Division of Product Development, Department of Industrial and Materials Science, Chalmers University of Technology, 412 96 Gothenburg, Sweden;
6. Volvo Powertrain, SE-405 08 Gothenburg, Sweden