Add to ORKGMany people directly and indirectly contributed to this thesis. Here, I would like to take the opportunity to thank them. Special appreciation goes to my supervisor and mentor, Prof. Charles Egbu, for his understanding, patience, constant support, encouragement and expert guidance through the years. The completion of this thesis would not have been possible without his openness to new ideas and the freedom given to me. I wish him good health and continued successes in his business. I am very grateful to the University Technology Mara (UiTM) and the Ministry of Higher Education, Malaysia for rewarding me the scholarship, which allowed this research to continue unimpeded. Also, CREAM, CIDB Malaysia for providing valuable assistance with the d...