Professional Librarian Experience: Four and one-half (4 -1/2) years of progressively responsible professional experience in one or more major functional areas of librarianship (e.g., selection, acquisition, cataloging and classification of materials, collection development and maintenance, reference and readers advisory services, or development and promotion of library services), which required the application of principles, practices, knowledge, theories and tools of library science. The work requires the use of experienced judgment in providing appropriate material and library services to the patrons/clientele of a particular library; performing specialized activities (e.g., cataloging and classification, reference and materials selection) within a complex and dynamic subject field(s); and/or planning, coordinating and evaluating library services in a major service/functional area.