Uganda has made great strides in the past few years building up the hardware of its public distribution system for medicines -- central warehouses and staffed distribution points -- but the software isn't quite right. Many health centers run out of medicines in the 2-3 months between deliveries, meanwhile central warehouses are chock-full of supplies. Medicine supply chain problems aren't news to Uganda's poor, many of them in remote rural villages, but few channels exist to bring that information to the public officials who are in position to do something about it. Taking lessons from its peers in other places and adapting them to its own context, HEPS gathered data to craft an advocacy campaign that convinced policymakers that supply chain problems weren't just isolated issues, they were systemic. Ugandan citizens have already seen early results of policy changes inspired by the HEPS campaign.