  I will review recent progress in the modeling of the stellar spectral energy
distributions of star-forming galaxies. I will cover the full relevant
wavelength range from the near-infrared to the extreme ultraviolet, with an
emphasis on the ultraviolet long- and shortward of the Lyman break where most
of the stellar luminosity is emitted. Uncertainties in stellar atmosphere and
evolution models will be critically examined, and the impact on the total
panchromatic luminosity will be highlighted.
