This plan, submitted annually, describes the U.S. initiatives carried out by Federal Agencies which either directly support or contribute to the goals of the World Weather Program. The lessons learned and application of the results from the recently concluded Data Systems Tests are highlighted in Section I. These tests were designed as controlled investigations into the operation of the observing, data communications and data processing systems likely to be available for FGGE--the Global Weather Experiment. Section 2 discusses the relationship of our national activities with those of other nations cooperating in the World Weather Program. Section 3 provides specific information on the U.S. planned efforts which contribute to or directly support the World Weather Program goals in FY 1977. A fiscal summary of these programs is contained in the concluding section.