  We present a new method to derive 2D star formation histories in dwarf
irregular galaxies. Based on multicolor stellar photometry data we have found
that in the Leo A galaxy during the last $\sim$400 Myr star formation was
propagating according to the inside-out scenario. Star-forming regions have
spread strongly asymmetrically from the center and their present day
distribution correlates well with the HI surface density maps.
