Effective use of the UML notation requires automated support to make certain that UML models are complete and consistent. Automated support for UML ranges from simple drawing tools to sophisticated multiuser environments that provide code and document generation, as well as aids to project management.This tutorial surveys important requirements for UML development tools, including: Support for the modeling process Support for the UML language (syntax and semantics) Tool usability Code, schema, and document generation Customizability and adaptability Scalability for large models Multi-user support Life cycle supportThe tutorial is accompanied by live demonstrations of several UML products as a way to illustrate some of the characteristics of various tools. These UML products cover the range of available products in price, scalability, and target market.