  Interactions between galaxies are suggested to be a mechanism responsible for
feeding Active Galactic Nuclei (AGN). Theoretical models show that interactions
are an efficient way to drive gas from the galaxy to the nucleus, however, the
observational evidence on this subject is controversial. Here we review results
in this field, discuss possible limitations of previous studies and the
importance of dealing with selection effects. We also show that there is no
significant difference in the percentage of low luminosity AGN and normal
galaxies with companions, and discuss possible interpretations of this result.
