On 1 to 4 October 1991, the international symposion "Vienna-Berlin-Prague. The Rise of Scientific Philosophy" took place on the occasion of the centenaries of three prominent representatives of logical empiricism, organized by the newly founded Institute "Vienna Circle' together with the Institut far Wissenschaft and Kunst and supported by the Austrian Federal Ministries for Science and Education. In the following report, most attention will be paid to German-speaking authors, as the English-language presentations are published in the present Yearbook,whereas the German material has appeared separately in the volume Wien — Berlin — Prag, published this year by Hölder-Pichler-Tempsky Verlag in Vienna.