An Environmental Impact Statement (EIS) is a report that looks at how a proposed change in land use could affect the environment. It's best to prepare an EIS during the planning process, after looking at current land use and considering different options, but before deciding on a specific plan. By doing this, an EIS can help decide if a project is feasible by considering environmental, economic, engineering, and aesthetic factors together. The article explains the basics of the planning process, environmental impact laws, and when an EIS should be made.