certain amount of special training; some have criticized this trend. Systems librarians develop, troubleshoot and maintain library systems, including the library catalog and related systems. Technical service librarians work "behind the scenes" ordering library materials and database subscriptions, computers and other equipment, and supervise the cataloging and physical processing of new materials. A Youth Services librarian, or children's librarian, is in charge of serving young patrons from infancy all the way to young adulthood. Their duties vary, from planning summer reading programs to weekly story hour programs. They are multitaskers, as the children's section of a library may act as its own separate library within the same building. Children's librarians must be knowledgeable of popular books for school-aged children and other library items, such as e-books and audiobooks. They are charged with the task of creating a safe and fun learning environment outside of school and the home. A young adult or YA librarian specifically serves patrons who are between 12 and 18 years old. Young adults are those patrons that look to library services to give them direction and guidance toward recreation, education, and emancipation. A young adult librarian could work in several different institutions; one might be a school library/media teacher, a member of a public library team, or a librarian in a penal institution. Licensing for library/media teacher includes a Bachelor or Master of Arts in Teaching and additional higher-level course work in library science. YA librarians who work in public libraries are expected to have a master's degree in Library and Information Science (MLIS), relevant work experience, or a related credential. Additional responsibilities Experienced librarians may take administrative positions such as library or information center director or learning resource officer. Similar to the management of any other organization, they are concerned with the long-term planning of the library, and its relationship with its parent organization (the city or county for a public library, the college/university for an academic library, or the organization served by a special library). In smaller or specialized libraries, librarians typically perform a wide range of the different duties. Representative examples of librarian responsibilities: Researching topics of interest for their constituencies. Referring patrons to other community organizations and government offices. Suggesting appropriate books ("readers' advisory") for children of different reading levels and recommending novels for recreational reading. Reviewing books and journal databases Working with other education organisations to establish continual, lifelong learning and