  Some aspects of the chemical evolution of late-type dwarf galaxies are
reviewed, together with their implications on three issues of cosmological
relevance: similarity to primeval galaxies, derivation of the primordial helium
abundance, contribution to the excess of faint blue galaxies. A more detailed
approach to model their evolution is suggested. The importance of deriving the
star formation history in these systems by studying their resolved stellar
populations is emphasized.

Astrophysics