ORGANIZED reseeding research within the Forest Service was begun in the Intermountain region in 1935. Prior to that time, reseeding investigations had been fragmentary and lacked continuity. The scale of research could not cope with the need for restoring the millions of acres of depleted range land. Since 1935, the Forest Service has built up a research program that is becoming increasingly able to supply the details necessary for "action" seedings. Some of the investigations have been conducted in cooperation with the Utah State Agricultural Experiment Station, the Soil Conservation Service, and the Bureau of Plant Industry, Soils, and Agricultural Engineering. In the development of the program an important consideration has been the assigning of seeding priorities to various types of range lands in the Intermountain region. For each type of land investigated, studies have been made on species suitability, methods of preparing seedbeds and seeding, the influence of site factors, plant breeding, and manner of grazing. The most outstanding methods and findings concerning each of these phases are described in the pages that follow.