After years of being prodded to provide more information about why films receive the ratings they do, the Motion Picture Association of America, which makes the ratings decisions, said on Tuesday that it plans to implement a check the box system that it hopes will satisfy its critics. MPAA Chairman Chris Dodd, speaking at the annual CinemaCon convention, said that the system is aimed at highlighting the box that appears in movie ads and on trailers that summarizes the reasons for a movie's rating. The aim, he indicated, is to give parents the information they need to navigate the rating system and movies coming to their theaters. John Fithian, chairman of The National Association of Theater Owners, which mounts the CinemaCon convention endorsed the MPAA move, saying it would give 'Parents the information they need to navigate the rating system and movies coming to this theaters.