TAMANI is a complex intervention for improving maternal and newborn health in Tabora, Tanzania. The overarching objective of this intervention is to address the challenges linked to (1) the decision to seek care, (2) the barriers to accessing care, and (3) the provision of the highest possible quality of care, collectively known as the “three delays”. Addressing these delays requires a complex set of changes in behaviors, attitudes, access to and use of resources, skills, and knowledge of clients and service providers. The intervention targeted the supply side by improving the quality of care at health facilities, and the demand side through programs to increase utilization of care through community engagement and addressing gender barriers to accessing care by women and their families.