  The star formation histories of Local Group galaxies are summarized. The
three large spirals are discussed individually, whereas the discussion of the
Local Group dwarfs concentrates on differences and commonalities. While Local
Group galaxies exhibit an amazing diversity in their star formation and
enrichment histories even within the same morphological type, they share a
number of common global properties. Major determining factors for their
evolution are galaxy mass and environmental effects such as ram pressure and
tidal stripping. It seems likely that low-mass dwarf irregular galaxies evolve
into dwarf spheroidals.
