I would like to express my sincere gratitude to God for the wisdom and perseverance He has bestowed
upon me during this research project and throughout my life. The success of this work was a result of the
valuable help from various persons. First, is Dr. H. Mvula from University of Malawi for his spiritual and
constant encouragement to complete the work. His supervision and thorough analysis of my work
consequently widened my scope of scholarship.
Lastly, I would like to thank my parents, siblings, my daughter and friends for the emotional and
financial support during this course.