Abstract
Massive star evolution is a key ingredient to understand the nearby and distant Universe. It has enabled us to understand the relationships between the various kinds of massive stars (O-stars, blue and red supergiants, WR stars), their properties and chemistries, their relative numbers in our Galaxy and in galaxies of other metallicities Z, which is a necessary step to make models of photometric, spectral and chemical evolution of galaxies. However, current theoretical models of massive stars still contain non negligible uncertainties, and still fail in explaining some fundamental observation-s. In this discussion, we point out the need for further theoretical and observational studies of massive stars. We show how FUEGOS on the VLT will allow a decisive and unique improvement in our understanding of the evolution of massive stars in galaxies with different metallicities.
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