 Prior to the system's implementation, premium services only provided information on potentially objectionable content via the listings magazines that were supplied to their subscribers.In January 1994, representatives from the cable television industry decided to develop a voluntary rating system for television programs, with premium channels ultimately opting to develop a system to rate all types of program content that may be considered inappropriate for children.Prior to the creation of the content descriptions, premium television services did not reference the content within a film, television series or special on-air (though program guides provided by the pay cable channels did reference the type of content in each program); instead pay channels usually only used vague explanations of adult content using the program rating (for example, "The following movie has been rated "PG-13" by the Motion Picture Association of America, some material may be inappropriate for young children, parents may wish to consider whether it should be viewed by those under 13").