This document contains the presentation slides for an introduction to OpenNMS. It summarizes that OpenNMS is an open source network management platform, the first to be developed under an open source model. It was created in 2000 and uses Java and other open source tools. The presentation provides an overview of OpenNMS's capabilities including fault, configuration, accounting, performance and security (FCAPS) management. It also summarizes the event-driven architecture, data model, discovery process, and support for SNMP.