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A SysML Requirements Model

Requirements engineering is a fundamental aspect of a systems engineering model. The discipline focuses on eliciting, analyzing and managing customer requirements early in the process. Once the requirements are understood, trade studies can be conducted to formally assess design options, typically using weighted choices. The requirements are managed as first class citizens and are formally allocated to development items and verification methods.

Enterprise Architect has extensive functionality to assist the modeler with every aspect of the requirements engineering discipline, including elicitation, modeling, management and testing. High quality engineering documentation can be generated out-of-the-box using a wide range of built-in templates, carefully crafted to extract the information in the models and present it in visually compelling and high quality documentation in a wide range of formats, including docx, pdf and html. The documentation engine is highly configurable, and documentation to match any engineering or organizational standard can be generated by creating templates and setting generation options.

The SysML Requirements Model provides the system requirements, the expected abstract behavior and the operating constraints that the designed system must conform to. This diagram shows an example requirements model for a Portable Audio Player.

This SysML Requirements Diagram depicts several hierarchies of requirements developed during the SysML Requirements Modeling phase of the Systems Engineering Process, in Sparx Systems Enterprise Architect.

This example displays several top level requirements such as 'Ease of Use' and then breaks those requirements down into more refined requirements such as the 'Graphical User Interface'.