1. Senior Lecturer, Dept. of Quantity Surveying, Univ. of Malaya, Kuala Lumpur 50603, Malaysia (corresponding author).
2. Professor of Construction Management, Dept. of Quantity Surveying, Univ. of Malaya, Kuala Lumpur 50603, Malaysia.
3. Research Assistant, Dept. of Quantity Surveying, Univ. of Malaya, Kuala Lumpur 50603, Malaysia.