A major step was taken at a meeting today in Washington D.C., co-chaired by UNAIDS, the UK and the US, where donors and developing countries agreed to three core principles to better coordinate the scale-up of national AIDS responses. Known as the “Three Ones”, the principles are: one agreed HIV/AIDS action framework that provides the basis for coordinating the work of all partners; one national AIDS coordinating authority, with a broad based multi-sector mandate; and one agreed country-level monitoring and evaluation system.