The authors have obtained spectrophotometry for central regions of five interacting systems of galaxies chosen from the Arp Atlas of Peculiar Galaxies. The data are analyzed to derive star-formation rates for different epochs in the galaxies' histories. Oxygen abundances are estimated from emission-line ratios, and stellar population mixes are determined via spectral synthesis modeling. All systems have near-solar oxygen abundances. The authors find only one system, Arp 299, to be definitely undergoing a burst of star formation, while the remaining systems are found to be characterized by nearly constant rates of star formation and are not obviously different from noninteracting disk galaxies.