InterWeave uses the Enterprise Architect modelling tool from Sparx Systems. 

Enterprise Architect provides full life cycle modeling for:

• Business and IT systems
• Software and Systems Engineering
• Real-time and embedded development

With built-in requirements management capabilities, Enterprise Architect helps you trace high-level specifications to analysis, design, implementation, test and maintenance models using UML, SysML, BPMN and other open standards for modeling.

Enterprise Architect is a multi-user, graphical tool designed to help your teams build robust and maintainable systems.

And using high quality, built-in reporting and documentation, you can deliver a truly shared vision easily and accurately!