This series will look at what we know about how progress has been achieved, and what are the key challenges that remain to be confronted.  These questions will become more urgent as we move towards the 2015 deadline for achievement of the MDG targets, and as policy makers begin to focus on how to maintain progress on the MDGs after that date.  This series will set the scene, by looking at what has been achieved, and at the key new challenges that we will have to confront to end poverty up to 2015 and beyond.