This is the user's guide for NED-2, which is the latest version of NED, a forest ecosystem management decision support system. This software is part of a family of software products intended to help resource managers develop goals, assess current and future conditions, and produce sustainable management plans for forest properties. Designed for stand-alone Windows-based personal computers, NED-2 integrates a variety of forest management tools into a single environment. These tools include databases, growth and yield models, wildlife models, geographic information systems (GIS), visualization tools, and others. The software is distributed with an online help system and a printed user's guide. This user's guide provides guidance for use of the software and a basic introduction to the principles and calculations used in NED-2. A reference guide with more detailed explanations of the models, equations, and rules that underlie the software is available separately.