Designing Modelling Tools

• IBM Rational DOORS

IBM® Rational® DOORS® software is a leading requirements management application that can help you reduce costs, increase efficiency and improve quality by enabling you to optimize requirements communication, collaboration and verification — throughout your organization and across your supply chain

http://www-01.ibm.com/software/awdtools/doors/

• Sparx Enterprise Architect

Enterprise Architect 9.1 is a high performance modeling, visualization and design platform based on the UML 2.3 standard

http://www.sparxsystems.com