This prospective randomized study demonstrated that the NCMIT program significantly improved completion of a 6-month HAV/HBV vaccine regimen when compared with the SI approach. Controlling for potential confounders, the NCMIT participants had almost 2 times greater odds of completing the HBV vaccination than that of the standard control. Although the SIT participants had 1.5 times greater odds of completing HAV/HBV vaccination than those of the standard control, these findings were not significant. The vaccination completion rates in both programs that incorporated tracking (NCMIT and SIT) were also higher than those in previous studies using financial incentives alone (Ompad et al., 2004). A modest monetary incentive has been approved as an effective strategy to increase HBV vaccination coverage in hard-to-reach populations (Trubatch, Fisher, Cagel, & Fenaughty, 2000). The findings suggest that targeted education and client tracking are also critical elements in supporting adherence.