fret software

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      Formal Requirements Elicitation Tool (FRET) is a requirements engineering tool. It was developed by the NASA Ames Research Center to specify complex safety-critical systems whose failure could result in loss of life, significant property damage, or environmental harm. FRET is open-source software released under the NASA Open Source Agreement.


      Background


      The behavior and features of a system are specified by its requirements. Most requirements are written in natural languages such as English, which is easy for analysts and stakeholders to understand but cannot be checked for errors and omissions using formal methods. On the other hand, formal notations such as VDM and Z, which are precise and unambiguous, tend to be difficult for analysts and stakeholders to understand.
      As a compromise, FRET requirements are created in a controlled natural language called FRETish and converted into temporal logic.


      Uses


      FRETish requirements can correspond to variables in external code or models. FRET generates and verifies formal equivalents for each statement, allowing requirements to be imported or exported in a variety of formats including JSON.
      In FRET, processes are simulated and analyzed by interfacing with external modeling and analysis tools. The supported external tools include COCO simulator, Simulink Design, Verifier, NuSMV, and Copilot.


      See also


      Functional requirement
      Non-functional requirement
      Objective
      Requirements analysis
      Software engineering
      Software Engineering Body of Knowledge
      Software requirements
      Software requirements specification
      Stakeholder analysis
      Systems engineering
      List of requirements engineering tools


      References

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