1. Civil Engineer, General Director of the Administration of Projects and Engineering Affairs, Ministry of Health, Medinah, P.O. Box 3891, Saudi Arabia (corresponding author).
2. Professor of Theory Based Lean Project and Production Management, School of the Built Environment, Univ. of Salford, Salford M5 4WT, UK.
3. Senior Lecturer, School of the Built Environment, Univ. of Salford, Salford M5 4WT, UK.