While Humphrey's conceptualisation of subject librarianship sets a differentiation between extensive subject knowledge through a degree and general subject which may not need a degree. Hardy and Corrall (2007) give an example of British universities where subject librarians do not have a degree in the subject which they are assigned. While given an example of where subject librarians have a degree in LIS and a degree in the respective subject. Meanwhile in the African context, Afavia (1983: 183) has added that subject librarians not only be defined by the knowledge they possess in a subject, but also the interest in the literature of a particular subject or field. Hence, Afavia (1983: 186) delineates subject librarianship into three categories where: