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TASSII - Total & Spectral Solar Irradiance Investigation A concept study for a solar observation instrument, TASSII's goal was the reliable determination of solar forcing of climate change. Its primary objective was measurement of the Sun's total solar irradiance (TSI), one of 24 geophysical parameters monitored by the Earth Observing System (EOS), with both accuracy and precision improved beyond present capability. Praxis provided decision support, program planning, web and multimedia design, and document management services for TASSII.