1. Professor, Dept. of Quantity Surveying, Faculty of Built Environment, Univ. of Malaya, 50603, Kuala Lumpur, Malaysia.
2. Associate Professor, Dept. of Quantity Surveying, Faculty of Built Environment, Univ. of Malaya, 50603, Kuala Lumpur, Malaysia.
3. Associate Professor, Dept. of Building Surveying, Faculty of Built Environment, Univ. of Malaya, 50603, Kuala Lumpur, Malaysia (corresponding author).
4. Dept. of Quantity Surveying, Faculty of Built Environment, Univ. of Malaya, 50603, Kuala Lumpur, Malaysia.