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Zusammenfassung Binary stars are considered as one of the best constraints on stellar formation models. Observations on multiple stellar systems are discussed in these proceedings! first published in 1992! with the aim of disentangling evidence of stellar formation from later physical evolution. Inhaltsverzeichnis 1. N-body simulations of primordial binaries and tidal capture in open clusters; 2. When and how can binary data test similar models?; 3. Statistical analysis of single-lined red giant spectroscopic binaries; 4. The formation of binary stars; 5. Distribution and evolution of orbital elements for 1 M primaries; 6. Tidal circularization of short period binaries; 7. Composite-spectrum binaries; 8. Orbital elements for field late-type binaries; 9. Evidences for interaction among wide binary systems: to Ba or not to Ba?; 10. Spectroscopic binaries in the open cluster M67; 11. Spectroscopic binaries in the halo; 12. Eccentricity evolution of a binary embedded in a disk; 13. The eccentricity distribution of pre-main sequence binaries; 14. A new algorithm to derive the mass-ratio distribution of spectroscopic binaries in open clusters; 15. Are barium dwarfs progenitors of barium giants; 16. RZ Eridani as a constraint on synchronization and circularization times; 17. Ekman layers and tidal synchronization of binary stars; 18. The distribution of mass ration in late-type main-sequence binary systems; 19. The dynamical evolution of G-type main sequence binaries; 20. Present state of the tidal theory; 21. Infrared companions: clues to binary star formation; 22. The distribution of cutoff periods with age: an observational constraint on tidal circularization theory.
