The Chemical Evolution of Galaxies: The Stellar Mass-Metallicity
  Relation
  The predictions of the multiple burst accretion model of chemical evolution
are compared to the observations of the stellar masses and metallicities of
star-forming galaxies. With the addition of one parameter, the model can
account for the observations of the star-forming galaxies if the observations
of the galaxies are identified with the star bursting behaviour of the model.
This consistency with the model holds only if galaxy downsizing is assumed to
occur.
