b'Prefacereconciliation of notes where the Canadian Companion contained more information and options,and the revision of Canadian headings Fur trade and Lacrosse to Fur tradeCanada andLacrosseCanada. The Sears List subdivision Description and travel was chosen over theCanadian subdivision Description. This inclusion aims to improve the efficiency and accessibility ofthe Sears List for catalogers by assembling the vocabulary into one volume. It also reflects theincreasing international use of the Sears List in library cataloging. Those headings that originated inThe Sears List Canadian Companion are not identified as such, as this edition of Sears List andthose going forward, are treated as one inclusive vocabulary.With the twenty-first edition, all headings conform to the new RDA standards. RDA, which standsfor Resource Description and Access, is the cataloging standard that replaced AACR2 in early 2013.While many of the rules have stayed the same, there is an impact on the format of subject headingsin certain areas. This new edition of the Sears List makes a concentrated effort to adhere to thosenew standards where applicable including bringing headings for fictional characters, legendarycharacters, and deities into compliance.Other revisions address the changing demographics of library users and aim to correspond moreclosely to current literature and library patron search expectations. This includes canceling headingssuch as Elderly in favor of Older people, and Aliens (Foreign population) in favor ofNoncitizens, both of which may be subdivided geographically by continent, region, country, state,or city.For the convenience of librarians maintaining their catalogs, these revisions and all other revisionsare spelled out in the List of Canceled and Replacement Headings found on page A-57.This twenty-second edition of the Sears List, the first to be published by Grey House Publishing,was edited by Barbara Bristow, a former H. W. Wilson employee and long-time colleague of JosephMiller, editor of the fifteenth and subsequent editions.The Scope of the Sears ListNo list can possibly provide a heading for every idea, object, process, or relationship, especially notwithin the scope of a single volume. What Sears hopes to offer instead is a basic list that includesmany of the headings most likely to be needed in small libraries together with patterns and examplesthat will guide the cataloger in creating additional headings as needed. New topics appear every day,and books on those topics require new subject headings. Headings for new topics can be developedfrom the Sears List in two ways, by establishing new terms as needed and by subdividing theheadings already in the List. Instructions for creating new headings based on the pattern in Searsand sources for establishing the wording of new headings are given in the Principles of the SearsList. The various kinds of subdivisions and the rules for their application are also discussed in thePrinciples of the Sears List.It is only by being flexible and expandable that Sears has been able over the years to fill the needs ofvarious kinds of libraries. The degree or level of specificity required for a collection depends entirelyon the material being collected. While a small library is unlikely to need very narrow topics of atechnical or scientific nature, it is not at all unlikely that it might have a gardening book on Irises. Thatterm is not in the List, but it would be added as a narrower term under Flowers.A-8'