In this video, Sumru Erkut, Ph.D., associate director and senior research scientist at the Wellesley Centers for Women, talks about the Critical Mass Project. The goal of the study was to determine how many women were needed on a corporate board in order for their contributions to make a real difference. The findings indicated that corporate boards needed three women to make a difference. The project also found that having three or more women on a corporate board can change the way the board runs, and that women make three distinct contributions: women bring a level of civility to the board; women pay attention to the stakeholders, not just the shareholders; and women often bring up difficult issues.