SINCE THE DISCOVERY OF EXTREMELY HIGH RADON LEVELS in the Reading Prong region in 1985, there has been extensive progress in the nation's program to reduce the risks of indoor radon. EPA's Radon Program has grown from a handful of researchers in isolated problem areas to an organized partnership of government agencies and private organizations working together on numerous fronts. To accommodate this rapid growth and to keep national radon efforts on track, EPA has continually evaluated and refined its strategy by adapting to new knowledge, increased experience, Congressional direction, and changing needs.