"I am not an optimist.... I'm a very serious 'possibilist'... someone who neither hopes without reason, nor fears without reason... I see all this progress, and it fills me with conviction and hope that further progress is possible. This is not optimistic. It is having a clear and reasonable idea about how things are. It is having a worldview that is constructive and useful." --Hans Rosling
We have much more work to do. But how can we do that work best if we do not know what has worked already? How can we achieve more success if we don't even have a clear idea of what success we have already managed?