markets, scores dramatically increased, showing the need for greater control. Due to events of the eventual court case, the Diversity Index never went into effect. Local television ownership rule The FCC modified local television ownership rules to allow tri-ownership in markets of 18 stations or more, and duo-ownership in all other markets, subject to a restriction on a combination of any of the four largest stations in any market. This change followed from a directive from the Telecommunications Act of 1996, in which Congress directed the FCC to examine its current rules which at the time prohibited common ownership of two stations with overlapping Grade B signal contours, known as the 'Single Market, Single Station Rule'. Local radio ownership rule Following a 1992 change in which the FCC abandoned a one-to-a-market limit on radio station ownership, new ownership rules allowed ownership of multiple stations, with the exact number depending on market size, up to 25% of audience share. The Telecommunications Act of 1996 then directed the FCC to further relax ownership limits, allowing up to eight stations in a market (no more than five in the same FM or AM), and to review the rules biennially. Following the 2002 Biennial Review, the FCC decided to change the meaning of 'radio market' from a contour-overlap methodology, to a geography based method used by Arbitron. At the same time as switching to Arbitron Radio Markets, the FCC decided to begin including non-commercial stations when determining the size of the market. These two changes somewhat offset each other, since switching to geography reduced the size of markets, while adding non-commercial stations increased the size, however, on average, the net effect was a slight decrease in market size. In applying these new rules, current ownership configurations that would be found impermissible once new rules took effect were grandfathered their existing ties. The commission's goal was to create a system of rules that promoted five equal sized competitors in each market. They arrived at this benchmark using Game Theory. Examining this line of economic thinking, it was decided that five equal competitors was the correct amount for optimal competition in a single market. Prometheus Radio Project The Prometheus Radio Project was founded in 1998 by activists working within social change movements such as housing, environmentalism, health care, anti-war, and criminal justice reform. Beginning as a group of pirate radio stations, the group of LPFM radio