The document reviews progress towards aid effectiveness in the water sector in Bangladesh, Ethiopia and Uganda compared to other social sectors like health and education. It finds that in the countries studied, the water sector is not lagging behind health and education in implementing the Paris Principles of aid effectiveness and has achieved moderate to strong effectiveness. However, political commitment, capacity, and incentives are important factors that influence progress in all sectors. National systems, rather than just the sector, determine how well donors can align with these systems. Not all actors have signed on to aid effectiveness, which can pose hurdles.