HSDF contributed research and analytical expertise to explore how the Four Ds influence health system performance and sustainability. The project focused on:

• Examining the impact of changing disease patterns on health systems.
• Analysing demographic trends and their implications for service delivery.
• Exploring how economic development shapes health financing and governance.
• Assessing the effects of changing donor funding landscapes.
• Identifying factors that support successful health system transitions.
• Generating evidence to inform policy, planning, and investment decisions.

The research emphasised practical insights that could help governments and development partners strengthen preparedness for future transitions.