The primary driver of constituent eligibility and selection into the S&P ESG Index Series is a company's S&P DJI ESG Score, which is derived from the annual SAM Corporate Sustainability Assessment (CSA). The CSA is an industry-specific questionnaire based on financial materiality and is designed to source corporate sustainability information directly from companies and used to assign ESG scores. Insights gathered from the CSA form the backbone of the ESG score that is incorporated in the index constituent selection process.