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Dynamics and Microphysics Program (CDMP) , the Ice Crystal Processes Program, and the Geographic Variability of Precipitation Efficiency Program. The Convective Storms Research Program, conducted by the National Center for Atmospheric Research (NCAR), comprises a broad base of physical studies on summer cloud systems with current emphasis on High Plains storms. The primary precipitation processes in these clouds are simple ice crystal growth; secondary ice crystal formation is uncommon. The CDMP will concentrace initially on the warm, modified maritime cloud systems of Florida where preliminary results of the Florida Area Cumulus Experiment (FACE) suggest that rainfall is increased by rapid glaciation of conveccive clouds that stimulates vercical growth. Secondary ice-forming proc~sses appear to be common in these clouds. The Ice Crystal Processes Program considers the basic problem of ice crystal formation and growth over a broad range of precipitation systems, both summer and winter. This program will build on information from various site- specific programs and will include laboratory experiments, computer modeling, and field measurements. The objective is to expand and integrate basic understanding of ice formation and growth processes. The Geographic Variability of Precipitation Efficiency Program will study the similarities and variations of cloud characteristics in various geographic areas and climatic regimes and will identify the important factors that determine the precipitation efficiency of the different regions and regimes. Although this program will focus initially on data from past programs, it too will draw heavily on data and knowledge obtained from future fundamental and Site-specific programs and field projects. The Small Project Research Program will support creative individual scientists and small groups in innovative research that promises to advance scientific understanding that is relevent to weather modifiction. This program will include support for education and training to develop new scientific talent. The basic health and vigor of a national program will depend on the creativi ty of individual scientists. A strong, stable program in small project research will attract well-qualified scientists and will support the training of new scientific talent. Therefore, highest priority within the fundamental research program area should be given to strengthening the Small Project Research Program at the National Science Foundation. First priority among the four major research programs should be given to the Convective Storms Program, followed in order by the Cumulus Dynamics and Microphysics Program, the Ice Crystal Processes Program, and the Geographic Variability of Precipitation Efficiency Program. vi