Acknowledgements
‗All things were made by Him; and without Him was not anything made that
was made‘ John 1:3
I would like to express my sincere appreciation to the following people who
were of great support to me during this study: Dr. Getie Andualem Imiru, my
supervisor, for his invaluable feedback and guidance that motivated me to stay
on track and complete this research. I am also indebted to my beloved wife
Sara Getachew and my charming kids Nuhamin Aschalew and Bethel Aschalew
for their innumerable encouragement and motivation. Finally, I would like to
thank Dr. Dawit Amogne, who edited and proof read my thesis tirelessly.
I thank you all and May God Bless you!
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