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.