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In recent years, financial economists and commercial providers of governance services have created measures of corporate governance quality that
collapse into one number (a governance rating or index) the multiple dimensions of a company's governance, measures which commercial providers market to institutional investors as aids for portfolio and proxy voting decisions. The aim of this Article is twofold: to analyze the effectiveness of corporate governance indices in predicting corporate performance and to consider the implications for public policy that follow from that assessment. We highlight methodological shortcomings of the extant research that claims to have identified a relation between particular governance measures and corporate performance. Our core conclusion is that there is no consistent relation between governance indices and measures of corporate performance.

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