The Corporate Sustainability Index (CSI) is a tool used to measure the sustainability performance of companies. It is a comprehensive assessment of a company’s environmental, social, and governance (ESG) performance. The index is used to evaluate a company’s sustainability performance relative to its peers and to identify areas for improvement. The index is based on a set of criteria that includes environmental, social, and governance indicators. Companies are scored on a scale of 0 to 100, with higher scores indicating better performance. The index is used by investors, companies, and other stakeholders to assess the sustainability performance of companies and to make informed decisions about investments.