Top 10 Most Challenged Books ListsEvery year, the Office for Intellectual Freedom (OIF) compiles a list of the Top 10 Most Challenged Books in order to inform the public about censorship in libraries and schools. The lists are based on information from media stories and voluntary reports sent to OIF from communities across the U.S., but they're only a snapshot of book challenges. Surveys indicate that 82-97% of book challenges – documented requests to remove materials from schools or libraries – remain unreported and receive no media.