ii DECLARATION We, the undersigned, declare that this is our original work and has not been submitted to any other college, institution or university other than the University of Nairobi for academic assessment and credit. Signed……………………….. Date……………………….. Edwin Machuki (X74/3668/2009). Signed……………………….. Date……………………….. Evans Momanyi (X74/3611/2009). Signed……………………….. Date………………………. Felix Ogwangi (X75/0711/2009). Signed……………………….. Date………………………. Fredrick Ochieng (X75/3810/2009). Signed……………………….. Date………………………. Dickens Oloo (X75/3750/2009). This project has been submitted for this examination with my approval as University Supervisor. Signed……………………….. Date……………………….. Dr. D. O. Abala (Supervisor).