First and foremost, a big thank you goes to the almighty for sparing me this life of mine and for his unreserved protection throughout my studies period. I extend my sincere gratitude to the head of Statistics South Africa (Stats SA) and production of Statistics in the country as a whole Mr. Pali Lehohla for his leadership and vision for transforming Statistics in the country as well as internal upliftment of employee skills within Stats SA. Thanks to Human Capacity Development (HCD), Management of Trade Statistics and colleagues in general the support and words of encouragement. A big thank you to my family for their continued support emotionally, psychologically and otherwise throughout the good and difficult periods I endured during my studies. My sincere gratitude also goes to Lectures and Management at the Institute of Statistics and Applied Economics (ISAE) as well as fellow graduates who offered me astuteness advice in drafting this dissertation. Lastly, this book would have not been successfully completed without the assistance, co-operation and patience of my supervisors Dr. B Ocaya, Dr. Y Mwanga and Mr. T Bwire. I thank you unreservedly for all your guidance.