Appendix A reviews scientific research on the effects of entertainment media violence on children, and Appendix B addresses the relationship of children, especially teens, to the world of entertainment and entertainment marketing. Appendix C focuses on First Amendment concerns that have been raised in the public debate regarding the marketing to children of entertainment media products with violent content. Appendix D provides an overview of the motion picture, music recording, and electronic game industries, including a brief view of the role they play in the U.S. economy, as well as information on industry revenue, major players and market share, sales of rated or labeled products, spending statistics, and future trends; it also reviews the historical development of the motion picture, music recording, and electronic game rating and labeling systems. Appendix E presents the Federal Trade Commission's (FTC's) requests for information from 61 members of the motion picture, music recording, and electronic game industries regarding their use of their industries' rating or labeling systems and their marketing practices for rated or explicit-content labeled products. Appendix F reviews the results of two types of research projects the FTC sponsored to address information gaps regarding how parents and children perceive and use the available rating and labeling systems. Remaining appendixes pertain to the following subjects: third-party views and suggestions for improvement of entertainment media rating and labeling systems; entertainment media rating information and self-regulatory efforts on the Internet; television, print, and online demographics; electronic game industry compliance with self-regulatory code requirements to disclose rating information on product packaging, in advertising, and online; and the application of antitrust principles to voluntary industry efforts to restrict marketing and sales of violent entertainment to children. Data and notes accompany each appendix.