Information Resources Development is an important activity of any library or information centre as it ensures efficient and effective functioning of libraries. This is because it facilitates not only provision of appropriate reading material to users, but also forms the basis for the generation of information services and products. Information resources development is possible only by the use of appropriate selection tools or guides or sources giving information about the different publications. These sources, in their turn, may either give information of existing publications and / or new and forthcoming publications. While to the former belong the category of bibliographies and published Manny catalogues emanating form publishers, printers, booksellers, etc. In addition, Current Accession Lists issued by scientific and techno-logical institutions can form tools for document selection.
The six general categories of selection aides are: