The preparation for this work started with my birth. Every thing I learned since that day contributed to this work. I certainly have had many teachers, friends, and advisors who helped shaping my knowledge, skills, and attitudes. I value and thank them all, especially my mother who has given me all she has, her life, Mohamed Kamel, my mentor and spiritual father during my growing years, El-Raee Abdo Sheta, whose instructions played a great role in forming my attitudes.