CHAPTER ONE
1.0     INTRODUCTION
Library classification forms part of the field of library and information science. It was a form of bibliographic classification (library classification are used in library catalogues, while “bibliographic classification”, also covers classification used in other kinds of bibliographic data bases). It goes hand in hand with cataloguing and classification, sometimes grouped together as technical services. The library professionals who engages in the process of cataloguing and classifying library materials is called a cataloguer or catalog librarian. Library classification scheme are one of the two tools used to facilitate subject access. The other consist of alphabetical indexing language such as Thesauri and subject headings.
Library classification of a piece of work consists of two steps. Firstly, the aboutness of the material is ascertained. Next, a call number (essentially, a book’s address) based on the classification scheme in use at the particular library will be assigned to the work using the notation of the systems.
However, a library classification is a system of grouping the like terms and separating them from the unlike one’s. library classification documents library materials or any information (books), serials, audio visual material, computer files, maps manuscripts, realia) according to their subject and allocating a call number (information needed) to that information resources. Bibliographic classification schemes group entitles together that are relevant the same subject, typically arrange in a hierarchical tree structure (like classification schemes used in biology). A different kind of classification scheme called a faceted classification scheme is also widely used which allows the assignment. It multiple classifications to an objects, enabling the classification to be orderly in multiple ways. Barr Jim (2009) knowledge management is about cooperation and contact.
It is important to note that unlike subject headings or thesauri where multiple terms can be assigned to the same work, in library classification schemes, each work can be placed in one class. This is due to shelving purposes. A book can have only one physical place. However, in cataloguing one may have main entries as well as added entries most classification scheme like Dewey Decimal Classification (DDC) and library of congress classification scheme also add a cutter number to each work which adds code for the author of the work.
Classification system in libraries generally play two roles. Firstly, they facilitate subject access by alloying the user to find out what is available in a give library on a particular topic. Secondly, they provide a known location for the information source to be accessed leg where it is shelved.
Lawrence Sand Giles CL (2006) Accessibility Information on the web nature.