  I review two observational programs which, together, promise to unravel the
detailed astrophysical evolution of normal field galaxies over the last 5-7
Gyr. Systematic ground-based spectroscopy of faint galaxies have revealed an
increasing faint end slope for the luminosity function with redshift. The trend
is strongest for galaxies undergoing intense star-formation. Deep images taken
with the repaired HST can be used to count galaxies as a function of
morphological type. Regular `Hubble sequence' galaxies follow the no-evolution
prediction, but irregular/peculiar sources have a steeper count slope and
provide the excess population. Although the overlap between the spectral and
HST samples is currently small, plans to merge similar datasets should reveal
the physical explanation for the demise of star formation in faint blue
galaxies since $z\simeq$0.5-1.
