Depression is highly prevalent among patients with heart failure (HF) and associated with lower levels of health-related quality of life and physical functioning, and higher risk of rehospitalization and mortality, and higher health costs. This Project will compare the effectiveness of a "blended" telephone-delivered collaborative care intervention for treating both HF and depression to: (1) collaborative care for HF-alone ("enhanced usual care"; eUC); and (2) doctors' "usual care" for depression (UC). If proven effective and cost-effective, the potentially more powerful, scalable, efficient "blended" care approach for treating HF and co-morbid depression could have profound implications for improving chronic illness care and stimulate development of "blended" interventions for treating other clusters of related medical conditions.