Add to ORKGI herewith declare this work to be my own, that I have acknowledged all the sources I have consulted in the thesis itself and not only in the references, that all wording unaccompanied by a reference is my own, and that no part of this assignment/essay has been directly sourced from the internet without providing the necessary recognition. I acknowledge that if any part of this declaration is found to be false I shall receive no marks for this thesis and that charges can be laid against me for plagiarism before the Central Disciplinary Committee of the University