HSS No.: HSS/I898/018Dii DECLARATION I, Ngami Phumzile Isabella Pewa declare that:The research reported in this dissertation/ thesis, except where otherwise indicated, is my original work.(ii) This thesis has not been submitted for any degree or examination at any other university.(iii) This thesis does not contain other persons' data, pictures, graphs or other information, unless specifically acknowledged as being sourced from other persons.(iv) This thesis does not contain text, graphics or tables copied and pasted from the Internet, unless specifically acknowledged, and the source is detailed in the thesis and in the references sections.