Star formation in colliding galaxies
P.-A. Duc

Interacting galaxies have been the focus on many studies on star formation. Their motivation are diverse. First of all, collisions are known to trigger starbursts though their importance in the global history of star formation in the Universe might have been overestimated. Second, interacting systems  offer a variety of environments, including the most extremes ones: from the dense nuclear region, to the external most regions along the tidal tails. They are therefore interesting laboratories to a) test the various mechanisms put forward to trigger SF: shocks following cloud-cloud collisions, compressive tides,  gravity   b) test the variations of the SF parameters (SFE, IMF, etc ) as a function of the local/large scale environment.