1. CIGEST, Business and Economic School, Instituto Superior de Gestão, Av. Mal. Craveiro Lopes 2A, 1700-284 Lisbon, Portugal
2. CEG-IST, Centro de Estudos em Gestão, Instituto Superior Técnico, University of Lisbon, Av. Rovisco Pais 1, 1040-001 Lisbon, Portugal
3. Centre for Local Government, University of New England, Armidale, NSW 2350, Australia
4. RCM2+, Research Centre for Asset Management and Systems Engineering, Lusofona University, Campo Grande 376, 1749-024 Lisboa, Portugal