The evaluation finds that the content of the World Bank's Country Policy and Institutional Assessment (CPIA) is largely relevant for growth and poverty reduction in the sense that it maps well with the determinants of growth and poverty reduction identified in the economics literature. However, some CPIA criteria need to be revised (in particular trade and finance), and one needs to be added (assessment of disadvantaged socio-economic groups). Second, the evaluation finds that the CPIA ratings are in general reliable and correlate well with similar indicators. The World Bank's internal review process helps guard against potential biases in having Bank staff rate countries on which their work programs depend. The CPIA ratings are found to correlate better with similar indicators for middle income countries than for low income countries. This could be because there is more information available on middle income countries, which increases the likelihood of different institutions having similar assessments on them. This could also be because the CPIA rating exercise takes into account the stage of development, which is more pertinent for low income countries, and which also subject the ratings of those countries to more judgment in an exercise that is already centered on staff judgment.