This document provides an overview of environmental impact assessment (EIA) history, need, process, and legal basis in Nepal. It discusses how EIA began in the 1970s in the US to make projects environmentally sustainable and spread globally after the 1992 Earth Summit. In Nepal, EIA was first recognized in the 6th plan in 1980 and legalized in the Environment Protection Rules of 1997. The EIA process involves scoping, impact identification and mitigation, approval procedures, and monitoring. Key EIA guidelines and regulations in Nepal are also outlined.