Encyclopaedia of Library Manual

Every profession needs its own body of knowledge to be exclusive, such that it sets it apart from other professions and establishes its identity as a profession. Medicine, Law, Engineering, Education, etc. have their own core of knowledge and mastery of their specialised core set them apart from each other and from the para professional group within their own category. This core makes them so exclusive that, as an example, even if the doctor were to sit under the coconut tree with his stethoscop