program, a method called continuous review, evaluation and weeding is used. This method makes it easier to routinely remove outdated and unused materials from the collection while also learning where the collection has gaps or it needs new items. Selection vs. censorship When acquiring new materials for a library's collection, it can be difficult to differentiate between selection and censorship. The American Library Association speaks of collections development as selecting materials that are desired by the community as well as fulfilling other educational and recreational criteria. The organization comments that a librarian should not purposely omit the purchase of books or other items due to them being controversial in nature, the author's religious or political views, or the librarian's personal beliefs. From the ALA website, they continue the argument by stating that, "Libraries should provide materials and information presenting all points of view on current and historical issues. Materials should not be proscribed or removed because of partisan or doctrinal disapproval." Checklists method This method of collection evaluation is the practice of checking a library collection against a list of notable books or materials to see if the collection includes these titles. This is the oldest method of collection evaluation, and its first recorded use occurs in 1849 by Charles Coffin Jewett at the Smithsonian Institution. Citation analysis Citation analysis is the method most used on the college and university level. This method looks at frequently used citations from bibliographies, indexes, and references to see if the resources used are included in the learning institute's partner library. The purpose is to see if the written work produced can be done using only the library located at the college or university. Citation analysis is a good research method to use in academic libraries on the university and college level when performing a collections evaluation. This method is performed by studying bibliographies from many sources such as student papers, faculty research publications, along with theses and dissertations. This information is then used to see what percentage of the items cited in the bibliographies have come from the academic library's collection. Citation analysis is used to see if the work produced at the university or college has been written using sources mainly from the academic library at that learning institution. Collections grid The collections grid is a model to discuss items in a collection in terms of their uniqueness, and the amount of