This paper focuses on how growth theory can guide growth policy design. It first argues that policy matters for growth, in particular when policy variables are interacted with country?specific variables (financial development, institutional environment, technological development, and so forth). Second, it argues that the Schumpeterian paradigm does a better job at delivering policy prescriptions that vary with country characteristics. Third, it discusses the advantages and drawbacks of growth regression analysis. Finally, it briefly describes and then questions the recently proposed 'growth diagnostic' approach