Finally, the librarian may help the user locate the materials. A second part of being a librarian involves technical work. For example, librarians order and receive materials. When materials arrive, librarians classify them by subject matter. They may enter information about the book into the computer system.
Librarians also supervise assistants who put the books on the shelves.
In large libraries, librarians may specialize in helping users or doing technical work. In most libraries, they do both types of work. Private libraries are associated with corporations, government agencies, law firms, and other specialized groups. In these libraries, the information is usually limited to subjects only of interest to the organization. Librarians at private libraries do in-depth information searches for library users in addition to running the library.