This paper from the Eldis web site considers approaches towards improving the predictability of aid to low income countries, with a special focus on budget support. The authors note that in order to accelerate progress towards the Millennium Development Goals, the donor community is increasing aid flows while pushing for more coordination and tighter performance-based selectivity. The document warns that these factors may increase the unpredictability of aid, from current levels, which are already high enough to impose significant costs. The authors recommend that to improve predictability, donors must extend their funding horizons.