1. Management School, University of Liverpool, Chatham Building, Chatham Street, L69 7ZH, Liverpool, UK.
2. CIGIP (Research Centre on Production Management and Engineering), Universitat Politècnica de València, Valencia, Spain.
3. CTS, Uninova, Dep. de Eng. Electrotécnica, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa, Caparica, Portugal.