1. Building and Real Estate Department, The Hong Kong Polytechnic University, Hong Kong
2. Department of Construction Management, University of Washington, Seattle, WA 98195, USA
3. Department of the Built Environment, Birmingham City University, Birmingham B4 7XG, UK
4. Faculty of Engineering and the Built Environment, University of Johannesburg, Johannesburg 2092, South Africa
5. Department of Construction Studies, SD Dombo University of Business and Integrated Development Studies, Wa P.O. Box 64, Ghana