  We present an analysis of the distribution and strength of star formation in
three nearby small galaxy systems, which are undergoing a weak interaction, a
strong interaction, and a merging process, respectively. The galaxies in all
systems present widespread star formation enhancements,as well as, in some
cases, nuclear activity. In particular, for the two closest systems, we study
the number-count, size, and luminosity distribution of H {\sc ii} regions
within the interacting galaxies, while for the more distant, merging system we
analyze the general distribution of the Halpha emission across the system and
its velocity field.
