Quick presentation

Atelier B 4.0 is a modelling tool supporting:

  • Software projects: for the development of a validated-by-proof software, modelled in B.
  • System projects: for the verification by mathematical proof of the specification of a system, modelled in Event B.

What's new with Atelier B 4.0

Core features

  • Automatic Refinement: B Automatic Refinement Tool (BART) for seamless refinement of models. BART will be introduced in beta 2 version.
  • Native support for Event-B language. 
  • A new C translator, ComenC, gathering industrial feedbacks and academic research project results.
  • Improvements to the well-definition proofs. Well-definedness proof obligations are now generated internally by Atelier B and  appear in the project status.

Redesigned GUI

  • Interactive prover improvements
  • Dedicated B editor, with syntaxic coloring, outline and code completion.
  • Parallelisation of typecheck, proof obligation generation and interactive proofs
  • GUI released as open source code

Supported platforms

  • GUI based onBased on QT
  • Available on Windows, MacOs, Linux and Solaris

New distribution policy

  • Free (non paying) version every two years. Atelier B 4.0 final release expected beginning of 2009.
  • Paying tool support (allows getting intermediary versions between the free version, other goodies)
  • Open-sourcing of many tools (ComenC, BART, B-Compiler, GUI) and documents (reference manual, trainings, etc. )








Atelier B 4.0 - Copyright (c) 2008 ClearSy System Engineering