The outlook for the restaurant industry remained positive in August, as the National Restaurant Association's comprehensive index of restaurant activity registered a modest gain. The Association's Restaurant Performance Index (RPI) - a monthly composite index that tracks the health of and outlook for the U.S. restaurant industry - stood at 101.1 in August, up 0.2 percent from its July level of 100.9. In addition, the RPI remained above 100 for the 52nd consecutive month, which represents expansion in the Association's composite index of eight key industry indicators.