TeamDefine is a rapid prototyping / simulation environment for software requirements definition. It enables business analysts and other non-technical users to easily translate concepts and elaborate textual business requirements into working models through storyboards and interactive simulations. Stakeholders can then walk through published simulations to review conceptual functionality and validate requirements -- before development begins. 

TeamDefine is a simulation tool designed to visually model and validate requirements for business analysts and development teams. TeamDefine provides a means to describe software requirements in both a visual and functional format. As a result, business analysts can use functioning simulations, live data, and screen-to-screen functionality to create, display, and validate requirements in real time. TeamDefine is a Web-based, platform and browser independent application that runs in a Web browser and assists with the discovery and design of simulations. With TeamDefine workspace you can develop step-based scenarios similar to use cases that provide business-process flows with validation features.