Major Greenwood, an early 20th century English epidemiologist, said that the reason epidemiology did not progress immediately from Hippocrates� time was that Hippocrates just considered phenomena rather than also counting them as Graunt did. In crude terms, we could say that Hippocrates was a qualitative researcher and Graunt a quantitative one. However, that said I must hasten to add that modern epidemiology embraces qualitative as well as quantitative approaches to problem-solving. This will be most apparent when we reach the section on hypothesis formulation.