When it comes to organ donation, the majority of American non-donors are passive-positives - they support organ donation but have yet to register as donors. A quasi-experimental, four-city, pretest/posttest study was conducted to assess the utility of the IIFF Model as a means of increasing registration among these individuals. Focus groups were used as the intervention context. In support of the model's utility, 46.6% of focus group participants signed donor cards at the end of the intervention. Extrapolated to the general population, such a finding could result in millions of new registrants. Retrospective analyses of reasons for non-registration provided before the start of the focus groups reveal that passive-positives placing culpability for non-registration on lack of knowledge or opportunity register signed-up at a rate of 63.6%. Passive-positives claiming to have put off registering because of their discomfort with thoughts of death or fear that organ donors are allowed to die so their organs can be harvested registered at a rate of 5.8%.