The ‘diffusion of responsibility’ hypothesis as an explanation of helping behavior (or lack of same) is qualified by suggesting that the hypothesis applies only in non-interacting situations. It is hypothesized that interacting groups who are aware of a help-demanding situation actually focus the responsibility and, therefore, take action as a group more rapidly than will a non-interacting group. Evidence is gathered in a contrived help-demanding situation employing a 2 × 3 (sex × condition) in which three conditions — alone, non-interacting (pseudo) groups, and interacting groups — are used. The evidence substantiates the major hypothesis. Speculation is also presented concerning the relationship of the ‘alone’ condition to the interacting and non-interacting groups and concerning sex effects.