The Technology Program GAST was executed from 1981 to 1987 as a German-Spanish joint program aiming at the development and the investigation of necessary solar specific components and software for a gas-cooled tower power station of medium size. After the tests had been successfully completed at the Plata- forma Solar de Almeria in 1987, the proceedings are now presented to inform the experts and the public about these developments and their results. Not intending to anticipate a detailed valuation of the results, however, we as the project monitors of the Technology program resume that the...