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F. Primas (ESO)
The availability of higher quality UV sensitive detectors and the launch of the Hubble Space Telescope have offered us new insights on the formation and galactic evolution of the light elements beryllium and boron. Their trends with metallicity (Fe and/or O) have come to be regarded as a powerful descriminant between different models of the chemical and dynamical evolution of the Galaxy. The higher accuracies achieved on Be and B determinations have offered extra constraints to stellar structure calculations, as far as depletion and mixing are concerned. \\
As larger samples of data were analyzed, it became clear that only by combining information on the abundances of the light elements, lithium, beryllium, and boron, in the same stars, a more consistent picture of their production, evolution, and depletion will be achieved. By reviewing the observational efforts that have been devoted so far to Be and B determinations in halo and disk stars of our Galaxy, the importance of having reached such a sample of stars for which LiBeB are all knwon will be emphasized. Current limitations, problematics and future needs will be highlighted.
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