FRET: Formal Requirements Elicitation Tool
Introduction
FRET is a framework for the elicitation, formalization and understanding of requirements. Users enter system requirements in a specialized natural language. FRET helps understanding and review of semantics by utilizing a variety of forms for each requirement: natural language description, formal mathematical logics, and diagrams. Requirements can be defined in a hierarchical fashion and can be exported in a variety of forms to be used by analysis tools.
Take a look at the FRET demo.
Contact
Please contact fret@lists.nasa.gov for further information on FRET. Detailed information can be found at the FRET manual.
Installation
Dependencies
Download and Install
As you open the FRET distribution, you shall see the following directory structure:
.
├── fret-electron
├── tools
├── README.md
└── LICENSE.pdf
Here are the steps to install and start FRET:
- cd fret-electron
- npm install ../tools/LTLSIM/ltlsim-core
- npm install
- npm start
It's as simple as that. Enjoy!
Notes
Note: To run the LTLSIM simulator, a NuSMV (see http://nusmv.fbk.eu/) installation is required. Please make sure that the NuSMV binaries directory is added to the PATH environment variable. Additionally, please add
$PATH_TO_FRET/fret/tools/LTLSIM/ltlsim-core/simulator
to the PATH environment variable.
Note: FRET requires python 2.x. If your machine is running a newer version of python, e.g., 3.x, then please config FRET to search for a python2 executable. Run the following:
npm config set python /usr/bin/python2.x
Note: Compiling on Windows machines requires gcc and the node-gyp prerequisites.
Note: If you would like to upgrade your nodejs version (and you have been using FRET before), please first remove node_modules under fret-electron/ and fret-electron/app/ and then do steps 2-4.
Note: Recommended npm version 6.x (comes with nodejs v10.x)
Platforms
FRET has been tested in a range of architecture/operating system combinations. It has been tested on PC Intel, Apple Mac and Sun architectures, with different versions and distributions of Linux, Windows and Mac OS X.
License
FRET has been released under the NASA Open Source Agreement version 1.3, see LICENSE.pdf.
Contributors
See the FRET Contributors.