We propose to use a System Modeling Language (SysML) [8] as a method for collection, management and documentation of user requirements. This method defines following diagrams: context, requirements, use case and test case diagrams. These diagrams are included in many commercial case tools e.g. VisualParadigm, Rhapsody, Enterprise Architect etc. There are also some open sources modeling tools as Papyrus for SysML [9] or TOPCASEDSYSML [10].