Requirements specification and modeling through SysML

Use case diagrams are well-known for their use to specify and describe system requirements. From initial system requirements documents, use cases can be derived representing several scenarios. These scenarios can later be detailed in different ways, as for example, through informal descriptions. In this paper, system requirements are first specified using the SysML requirements diagram and later by use cases. The main goal is to fill the gap between documents written in natural language and use cases by modeling requirements in a graphical and tabular way, which can improve the requirements representation. Also, the relationship between requirements is enhanced. An example of a real time distributed system is given to illustrate the approach.