expected to be verified by the end of this phase, and test operation to verify the cost model and provide data for the economical analysis. These job evolutions are summarized in Table 1. CONCLUSION (1) The SPS is such a large and complicated system that intensive research in the many disciplined areas are required for research and development of the SPS. (2) At an early stage of the SPS project, research and development works should be started before a multidisciplined SPS project is authorized. If an existing research project is managed properly, it can produce as much data as a dedicated project. The Space Station and the International Geophysical Year research are typical enterprises that incorporate SPS study. (3) It is important that an SPS-minded multidisciplinary research group should be involved in the center of such a research project in cooperation with individual specialists. (4) Multidisciplinary research will be necessary throughout the project phases. The job plan of disciplined research should be to identify task areas of the whole project. REFERENCES 1. U.S. Congress Office of Technology Assessment, Solar Power Satellite (summary), Aug. 1981. 2. P.E. Glaser, Solar Power Satellite—What, How, and When? Space Solar Power Review 1, 245-246, 1980. 3. K. Kuriki, M. Nagatomo, H. Okuda, and T. Yamanaka, Japanese Free-Flying Satellite, presented at the 34th Congress of the International Astronautical Federation, Budapest, Hungary, 10^15 October 1983, paper No. IAF-83-31. 4. M. Nagatomo, Space Station: An Early Experimental Solar Power Satellite, presented at UNISPACE ’82, Energy from Space Symposium, 1982, Space Solar Power Review, 4, 143-154, 1983.
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