This paper draws together a variety of openness measures to test the association between openness and growth, Although the correlation across different types of openness is not always strong, there is generally a positive association between growth and different measures of openness, The strength of the association depends on whether the specification uses cross-section or panel data (which combines cross-section and time series). For industrializing countries, which have exhibited significant fluctuations in trade regimes over time, long-run averages may not serve as very meaningful indicators of policy.