Wikipedia – A New Community of Practice? O'Sullivan discusses the group's aims; its community and make-up; its costs of doing business (transaction costs); its relations with the public; and its legacy. The second part of the book applies the group theory approach to Wikipedia, devoting a chapter to each aspect. Chapter 10, on the structure of Wikipedia, explains the use of "talk pages" and . Chapter 13, "Wikipedia and the Nature of Knowledge," explores the question of expertise. In this chapter O'Sullivan claims a fundamental disagreement between Wikipedia's two founders, Jimmy Wales and Larry Sanger. While Wales, an admirer of the economist Friedrich Hayek, believed in the
History of Wikipedia Wikipedia, describing the latter as "broken beyond repair." By 2005 Wales began to dispute Sanger's role in the project, three years after Sanger left. In 2005, Wales described himself simply as the founder of Wikipedia; however, according to Brian Bergstein of the Associated Press, "Sanger has long been cited as a co-founder." There is evidence that Sanger was called co-founder, along with Wales, as early as 2001, and he is referred to as such in early Wikipedia press releases and Wikipedia articles and in a September 2001 "New York Times" article for which both were interviewed. In 2006, Wales said,