In this post on the Center for Global Development’s (CGD) “Global Health Policy” blog, Amanda Glassman, director of global health policy and a research fellow at CGD, and Denizhan Duran, a research assistant in global health policy at CGD, describe a paper they wrote in which they try to determine “[w]hich donor provides the ‘best’ health aid, and why [this is] a relevant question.” They write, “To be honest, one working paper later, we still do not have a definite answer to either question,” but “we do know … that health aid is relevant: effective health aid has saved lives, and technologies like oral rehydration salts and vaccination are among the most efficient development interventions money can buy.” The authors say they “rank donors across four dimensions of aid effectiveness: maximizing efficiency, fostering institutions, reducing burden and transparency and learning,” and invite readers to explore their data (2/8).