Diabetes is one of the most common chronic illnesses among adults in the United States. Merck & Co., Inc. has produced an innovative website to engage adult patients in chronic illness self-management and medication adherence. Internet-based interventions and health promotion websites for patients are typically low-cost, easily accessible, and attractive. However, there is a growing need for improved measurement, implementation and evaluation of online health interventions to ensure patient engagement and produce more significant behavior change that can impact patients' health over the long term.