Macroeconomics is at a crossroads. The call of real science is drawing it forward to a degree that is without precedent in the history of the field. But the field's origins are related to the exceptional policy relevance of macroeconomics, and the field continues to be pressed for answers to difficult policy problems that sometimes are beyond the current capabilities of the field. Continuing tensions exist between policy demands and the constraints of systematic, rigorous scientific development. A commonly mentioned example is the increasing size of structural macroeconometric models. While highly regarded in many governments, those massive models are greeted with skepticism by the best economics journals.