I would like to express my sincere thanks, deep sense of gratitude andrnindebtedness to my adviser Professor Teshome Mulat for his keen interest,rnvaluable guidance, and sustained help for the completion of this thesis. I amrngrateful to the graduate school of Addis Ababa University for financing thisrnthesis.rnI am also delighted to express my heart felt gratitude and sincere thanks to myrndear wife Ajiba Mohammed, my brother Ato Ahmed Yuya, and my friend FuadrnUsmail for their unfailing support and moral encouragement throughout myrnstudy time. I am thankful to my friend Malaku Teklea for his relentlessrncooperation in searching documents and data management.rnMy heart felt thank also extends to the Federal and Oromia Civil ServicernCommissions, UNECA library, Central Statistical Agency, and Ministry ofrnEducation for providing the required data and documents. My special thanksrnalso go to Ato Tekalign Birhane, the commissioner of the Oromia Civil ServicernCommission, for his invaluable support. I am thankful to the Oromia Ethics andrnAnti Corruption Commission for sponsoring my study and to w/o AberashrnTamiru for typing this thesis in an attractive manner.rnFinally, I would like to notify that any unintentional omission in this briefrnacknowledgement does not mean lack of gratitude.