WHEN President Roosevelt signed the Social Security Act in August, 1935, he described it as the cornerstone in a structure which is being built, but is by no means complete. In January, 1938, less than two years after federal funds to implement the Act became available, the President transmitted to Congress recommendations for amending it, which represent another step in this long-term business of building a nation-wide socialsecurity program. These proposed amendments would extend the coverage of the old age insurance system; speed up, in many states, the payment of unemployment compensation benefits; and simplify the administration of both programs. Aside from their intrinsic importance, they are significant as indications of basic policy with regard to the development of the Act. That policy, accepted alike by the President, the Congress, and federal administrative agencies, is one of learning by experience. The Act laid down the framework for a more comprehensive program of social legislation than any other nation has ever undertaken at one time. Those responsible for its further development have taken the position that administering the present law is the best, if not the only, way of determining what — and when — legislative changes can be wisely undertaken. All the proposals presented by the President are based on the Social Security Board's experience in administering the law as it now stands.