This document provides guidance on principles and guidelines for conducting a social impact assessment (SIA). It discusses the types of impacts that should be considered in an SIA, including social, cultural, demographic, economic, and social-psychological impacts. It states that SIA experts should focus on more significant impacts, use appropriate measures and information, provide quantification where possible, and present impacts in a way that is understandable to decision-makers. The document cites the Interorganizational Committee on Principles and Guidelines for Social Impact Assessment from 2003 as the source for guiding principles for conducting an SIA.