This document is a methodology guide for MSCI Sustainable Impact Metrics, which is a data product from MSCI Sustainability & Climate. The objective of the metrics is to identify companies that generate revenues from products or services that have a positive impact on the environment or society. The metrics are based on disclosed activities and revenue estimates derived from company disclosures and other eligible sources. The document outlines the methodology used to categorize products and services that can address environmental and social challenges. It details the data structure and provides summaries of environmental and social impact metrics. Additionally, it describes the research process, including data sources, minimum data availability requirements, and evaluation steps. The methodology also addresses the treatment of subsidiaries and data mapping, ensuring quality and consistency in the evaluation process. The document serves as a comprehensive reference for understanding how MSCI assesses sustainable impact.