  We present multiband photometric observations of three spiral galaxies
selected in a sample suited for the study of young stellar groupings and their
relationship with the parent galaxy and the galactic environment. Star forming
regions have been identified using an objective technique based on a
multivariate statistical analysis. Maps of young star groupings are given for
each galaxy. The luminosity functions of the young star group populations show
a remarkable similarity with a slope in the range -1.52 to -1.33 range. The
size distributions peak around the classical 100pc value of the Local Group
associations for two out of the three galaxies. NGC 1058 shows smaller
associations (peak at about 50pc). The total number of young groups per unit B
absolute luminosity of the galaxy is significantly greater in UGC 12732. The
activity of star formation is in all three galaxies clearly stronger in the
central regions.
