I do not understand this work. Chapter 2 is supposed to be the Literature Review but you also have a lengthy section on the causes of dropouts which should be in a later chapter. Much, indeed,most, of this latter material appears to be directly copied from elsewhere without acknowledgement and so is plagiarism.
I have now received several versions of chapter 2 and while some of the work has been satisfactory, unfortunately, overall, it is not , in my view, of the standard required for a PhD, particularly with what appears to be extensive plagiarism..
Brian Sheehan, 23 August, 2016.