This website is last updated on: 30-06-2022.

Modeling and analysis of communicating systems (book)

mCRL2 is a formal specification language with an associated toolset. The toolset can be used for modelling, validation and verification of concurrent systems and protocols. It can be run on Windows, Linux, Apple Mac OS X and FreeBSD.

The toolset supports a collection of tools for linearisation, simulation, state-space exploration and generation and tools to optimise and analyse specifications. Moreover, state spaces can be manipulated, visualised and analysed.

The mCRL2 toolset is developed at the department of Mathematics and Computer Science of the Technische Universiteit Eindhoven, in collaboration with the University of Twente.


The latest release, mCRL2 202206.0, is now available from the download page. This release mainly contains two new symbolic tools called lpsreach and pbessolvesymbolic and contains several bug fixes. Unfortunately, these tools are not yet available on Windows. See the changelog for a detailed list of changes.


TACAS artefact evaluation badge

A tool paper explaining the latest developments in mCRL2 was published in TACAS2019. The new features include counterexamples, probabilistic processes and efficient algorithms for several types of behavioural relations. As part of the review process, mCRL2 was tested and accepted by the TACAS artefact evaluation committee. The paper is available under open access.


On Coursera four consecutive courses consisting of approximately 60 lectures provide an introduction into the theory and practical use of the mCRL2 toolset. It is based on the book ‘Modeling and Analysis of Communicating Systems’ shown above. The courses are:

The slides used to make these courses are available by contacting They can also be downloaded from MIT Press.


Verum is the industry leader in reliable software design.

mCRL2 is used by the company Verum as their verification engine. Verum provides model based software development environments for the languages ASD and Dezyne that allow to program proven correct embedded software with much less effort than “classical” programming. As it stands Verum is the industry leader in reliable software design.


The mCRL2 project uses TeamCity for regression testing during development and building the daily snapshots.