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In this paper we briefly review three topics that have motivated our (andothers') investigations in recent years within the context of evolutionarypopulation synthesis techniques. These are: The origin of the FUV up-turn inelliptical galaxies, the age-metallicity degeneracy, and the study of themid-UV rest-frame spectra of distant red galaxies. We summarize some of ourresults and present a very preliminary application of a UV grid of theoreticalspectra in the analysis of integrated properties of aged stellar populations.At the end, we concisely suggest how these topics can be tackled once the WorldSpace Observatory enters into operation in the midst of this decade.

Open Issues on the Synthesis of Evolved Stellar Populations at Ultraviolet Wavelengths