Jersey), which show that parents find the ratings useful. Critics such as Matt Stone in Kirby Dick's documentary This Film Is Not Yet Rated respond this proves only that parents find the ratings more useful than nothing at all. In the film, it is also discussed how the MPAA will not reveal any information about how or why certain decisions are made, and that the association will not even reveal to the filmmaker the specific scenes that need to be cut in order to get an alternative rating. Accusation of "ratings creep" Although there has always been concern about the content of films, the MPAA has been accused of a "ratings creep", whereby the films that fall into today's ratings categories now contain more objectionable material than those that appeared in the same categories two decades earlier. A study put forward by the Harvard School of Public Health in 2004 concluded that there had been a significant increase in the level of profanity, sex and violence in films released between 1992 and 2003. Kimberly Thompson, director of the study, stated: "The findings demonstrate that ratings creep has occurred over the last decade and that today's movies contain significantly more violence, sex, and profanity on average than movies of the same rating a decade ago." Questions of relevance Slashfilm.com managing editor David Chen wrote on the website: "It's time for more people to condemn the MPAA and their outrageous antics. We're heading towards an age when we don't need a mommy-like organization to dictate what our delicate sensibilities can and can't be exposed to. I deeply hope that the MPAA's irrelevance is imminent." Chicago Tribune film critic Michael Phillips wrote that the MPAA ratings board "has become foolish and irrelevant, and its members do not have my interests at heart, or yours. They're too easy on violence yet bizarrely reactionary when it comes to nudity and language." See also List of highest-grossing R-rated films List of NC-17 rated films Common Sense Media Entertainment Software Rating Board Film Advisory Board Green Sheet (filmmaking) Parental Advisory Pink permits TV Parental Guidelines United States Conference of Catholic Bishops' Office for Film and Broadcasting Film censorship in the United States References External links Classification and Ratings Administration Official Website with ratings database MPAA Film Ratings website Motion picture rating systems Film rating system Film censorship in the United States Certification marks Cinema of the United