1. WITS Business School, University of Witwatersrand, Johannesburg 2158, South Africa
2. Oxford Brookes Business School, Oxford Brookes University, Oxford OX3 0BP, UK
3. Department of Industrial and Systems Engineering, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates
4. Mechanical Engineering Department, The University of Melbourne, Melbourne, VIC 3010, Australia
5. IAE Business School, Universidad Austral, Buenos Aires B1630FHB, Argentina
6. Production Engineering Department, Universidade Federal de Santa Catarina, Florianopolis 88040-900, SC, Brazil