This volume, number 16 in the Space Sciences Series of ISSI, reviews the present knowledgeonmanyaspectsofthehistoryofthesolarsystem. Itfocuses onisotopic signatures ofvolatile elements as tracers for the evolutionary processes during the formation of the Sun and the planets from an interstellar molecular cloud and, in tum, illuminates how the isotopic compositions of present-day solar system ob jects had been established. This integrated collection of articles complements the information provided by previous ISSI volumes such as From Dust to Terrestrial Planets and Chronology and Evolution of Mars, expanding the time scale for the history ofthe solar system. The convenors, Therese Encrenaz, Observatoire de Paris, Meudon; Johannes Geiss, ISSI, Bern; Reinald Kallenbach, ISSI, Bern; Konrad Mauersberger, Max Planck-Institut fUr Kernphysik, Heidelberg; Tobias Owen, University of Hawaii, Honolulu; and Fran~ois Robert, CNRS-Museum d'Histoire Naturelle, Paris, in vited experts in planetary science, solar and heliospheric physics, astrophysics, mineralogy, and chemistry to an interdisciplinary workshop in Bern, 14-18 Jan uary 2002. The resulting review articles are grouped into four sections 'Sun and Protosolar Nebula', 'Outer Solar System', 'Earth, Terrestrial Planets, and Moon', and 'Isotopic FractionationProcesses'.

Zusammenfassung
Proceedings of an ISSI Workshop, 14-18 January 2002, Bern, Switzerland

Inhalt
Sun and Protosolar Nebula.- Isotopic Composition of H, He and Ne in the Proto solar Cloud.- Oxygen Isotopes in the Solar System.- Isotopes of Volatiles in Pre-solar Grains.- Atomic Deuterium/Hydrogen in the Galaxy.- Deuterium in Molecules of the Interstellar Medium.- Deuterium Fractionation in Interstellar Clouds.- The D/H Ratio in Chondrites.- Outer Solar System.- Evolution of the Protosolar Nebula and Formation of the Giant Planets.- Element Abundances and Isotope Ratios in the Giant Planets and Titan.- Isotopic Abundances in Comets.- Isotopic Signatures of Presolar Materials in Interplanetary Dust.- Earth, Terrestrial Planets, and Moon.- Nitrogen Isotopes on the Moon: Archives of the Solar and Planetary Contributions to the Inner Solar System.- Noble Gas Isotopes on the Moon.- On Noble Gas Processing in the Solar Accretion Disk.- Elemental and Isotopic Abundances of Carbon and Nitrogen in Meteorites.- Isotopic Criteria for Identification of Organic Carbon on Earth and Meteorites.- Isotopic Fractionation Processes.- Oxygen Isotope Processes and Transfer Reactions.- Isotopic Fractionation by Gravitational Escape.- Isotopic Fractionation by Ion-Molecule Reactions.- Isotopic Fractionation by Plasma Processes.- Working Group Reports.- Sun and Protosolar Nebula.- Isotopic Signatures of Volatile Elements in Terrestrial Planets.- Epilogue.- List of Acronyms.