for the continuous support of my PhD thesis and related research, for their patience, motivation, and immense knowledge. Their insightful comments and guidance helped me in all the time of research and writing of this thesis. I could not have imagined having a better advisors and mentors for my PhD study.My sincere thanks also goes to Dr. Steve Probets, who provided me with precious support over the first two years of this research.My acknowledgment also goes to the participants in this study, who agreed to be interviewed and gave me opportunity to interact with them, and obtain material for the completion of this study.Finally, I would like to thank Princess Nora University and the Saudi Arabian Ministry of Education, for providing the funding which allowed me to undertake my PhD study.