Library science is an interdisciplinary or multidisciplinary field that applies the practices, perspectives and tools of management, information technology, education and other areas to libraries; the collection, organization, preservation and dissemination of information resources; and the political economy of information. Historically, library science has also included archival science. This includes how information resources are organized to serve the needs of select user group, how people interact with classification systems and technology, how information is acquired, evaluated and applied by people in and outside of libraries as well as cross-culturally, how people are trained and educated for careers in libraries, the ethics that guide library service and organization, the legal status of libraries and information resources and the applied science of computer technology used in documentation and records management. Research compromises creative work undertaken on a systematic basis in order to increase the stock of knowledge, including knowledge of man, culture and society, and the use of this stock of knowledge to devise new applications. It is used to establish or confirm facts, reaffirm the results of previous work, solve new or existing problems, support theories. A research project may also be an expansion on past work in the field.