Requirements Studio CLASSIC version combines IBM DOORS, the proven requirements management environment with SodiusWillert ReqXChanger. Leverage the rich requirements management feature set provided by IBM DOORS Classic and use ReqXChanger to share ReqIF-compatible requirements data with UML modeling tools for bi-directional traceability. Requirements Studio NEXT provides you with IBM DOORS Next, ReqXChanger, and our RM Widgets that automate previously manual tasks or enable advanced filtering.