As with other professions, teaching in universities was only carried out by people who were properly qualified. In the same way that a carpenter would paper through the grades of apprentice and journeyman to attain the status of master carpenter when fully qualified by his guild, a teacher would become a master when he had been licensed by his profession, the internship guild
The earliest doctoral degrees (theology - Divinitatis Doctor (D.D.), philosophy - Online Criminal Justice Degree Doctor of philosophy (D.Phil., Ph.D.) and medicine - Medicinæ Doctor (M.D., D.M.)) reflected the historical separation of all University analysis into these three fields. Over future the D.D. of the old school gradually become less common and information studies outside theology and medicine have become enhanced common (such information theory were then called "philosophy", but are now classified as sciences and humanities - however this usage survives in the degree of Doctor of Philosophy).