Two papers on VerCors accepted at iFM 2020!!!

August 21, 2020

Our papers Mohsen Safari and Marieke Huisman - A Generic Approach to the Verification of the Permutation Property of Sequential and Parallel Swap-based Sorting Algorithms, and Lars van den Haak, Anton Wijs, Mark van den Brand and Marieke Huisman - Formal methods for GPGPU programming: is the demand met? were accepted in iFM 2020. Moreover, the former paper is our first ChEOPS project paper.

Members Graduation!

June 1, 2020

Two of our ex-master students, Bob Rubbens and Ömer Şakar, have recently graduated (see here and here ) and have decided to join the VerCors team as PhD candidates in the Mercedes project and ChEOPS project respectively. Nice that we have managed to keep them with us!

New PhD Student in Mercedes Project

March 11, 2020

From 1st of March, Lukas Armborst is our new PhD student working on the Mercedes project.

Paper accepted at NFM

February 21, 2020

Formal Verification of Parallel Prefix Sum written by Mohsen, Wytse, Sebastiaan and Marieke has been accepted for this year edition of NFM .

Paper accepted at TACAS 2020

February 20, 2020

Automated Verification of Parallel Nested DFS written by Wytse, Marieke, Sebastiaan and Jaco has been accepted for this years edition of TACAS.

Best paper award at IFM 2019

February 19, 2020

The paper Practical Abstractions for Automated Verification of Message Passing Concurrency written by Wytse Oortwijn and Marieke Huisman got the best paper award at IFM 2019 conference .

Wytse IFM best paper price.

Welcome Petra to the VerCors team!

February 1, 2020

From February 1st, Petra van den Bos has joined our team as a PostDoc under the Mercedes Project. Petra finished her PhD studies at the Institute for Computing and Information Sciences of the Radboud University in Nijmegen, the Netherlands, under the supervision of Jan Tretmans and Frits Vaandrager. During her work she focussed on topics around model-based testing. However, she also enjoys working on other topics inside formal methods and we are very happy to have her working along us and improving VerCors.

2019 VerCors team picture

December 12, 2019

On the occasion of Wytse Oortwijn’s PhD defence, a big part of the VerCors (former and current) team members got reunited. We were able to take this very nice picture together:

VerCors members

May 2020 bring even more people into our picture!

New VerCors related work

November 4, 2019

Anton Wijs and Maciej Wiłkowski present a paper involving VerCors at SEFM 2019

In Modular Indirect Push-Button Formal Verification of Multi-threaded Code Generators, Anton Wijs and Maciej Wiłkowski use VerCors to assist the verification of automated code generation of multi-threaded programs for model-driven development.

FMT member Sophie Lathouwers wins the Greenhost prize of the Koninklijke Hollandsche Maatschappij der Wetenschappen

November 4, 2019

Sophie Lathouwers has won the Greenhost prize of the Koninklijke Hollandsche Maatschappij der Wetenschappen with her Master thesis “Reasoning About the Correctness of Sanitizers.”

The prize is in the category of Internet & Technical Sciences, it is awarded through the KHMW (Royal Dutch Institute of Sciences), and sponsored by Greenhost. The prize-giving ceremony will take place on Thursday November 7 next at 15:00 in Amsterdam (REC, room C0.01, Nieuwe Achtergracht 166). There, Sophie will give a short presentation on her work. For more information visit here .

"Wytse Oortwijn's PHD thesis defence: December 12"

November 4, 2019

Wytse Oortwijn PHD thesis defence is approaching

Wytse has contributed to VerCors for several years, during his PhD projects in the FMT group under the supervision of Prof Marieke Huisman. He will be defending his thesis, entitled “Deductive Techniques for Model-Based Concurrency Verification” on Thursday 12th of December, 16:30 to 18:00 at Waaier, 4-G, Berkhoffzaal, University of Twente. For an introduction to his thesis and more information about the defence follow this link.

Marieke Huisman talked about software reliability at KNAW

November 4, 2019

Prof. Marieke Huisman, leader of the FMT group and the VerCors team, was one of the speakers at a public symposium called Verificatie van software: erg complex maar in ieders belang (Software verification: very complex but in everyone’s interest) at the Koninklijke Nederlandse Akademie van Wetenschappen.

She gave an overview of the area of deductive program verification, and how VerCors contributes to this area. Here’s an impression of the evening. A recording of the symposium will be made available via TXT radio.

Two papers accepted at iFM 2019

October 9, 2019

Two papers written by Wytse Oortwijn and Marieke Huisman have been accepted in this year’s edition of iFM.

“Practical Abstractions for Automated Verification of Message Passing Concurrency” presenting a new technique which integrates model based verification and code verification for message passing programs and “Formal Verification of an Industrial Safety-Critical Traffic Tunnel Control System”, a case study in the use of VerCors in a critical industrial system, have been accepted at the 15th International Conference on integrated Formal Methods taking place between the 2nd and the 6th of December this year, at Bergen, Norway.

Blind Henk Mulder now receives a master degree

July 10, 2019

On July 10th, 2019, Henk Mulder got his Master degree at University of Twente.

Henk Mulder did his Master Thesis at the Formal Methods and Tools group, on identifying and solving bottlenecks in the VerCors tool, under the supervision of Marieke Huisman. The VerCors toolset can be used to verify memory safety and functional correctness of concurrent and parallel programs. By encoding the problem into an intermediate language the power of existing tools is leveraged to support additional concurrency models. However, for certain programs verification takes significant time. Thanks to the work of Henk Mulder, we now know why, and more importantly, what we can do about it.

Thesis document

Henk Mulder got a 9 for his Master project, and graduated Cum laude. Our congratulations go out to Henk Mulder, on this great accomplishment!

VERCORS Advisory Board Meeting

June 6, 2019

An advisory board meeting of VerCors was held in University of Twente on June 6, 2019. VerCors Team elaborated main tool features with the board members from different industrial organizations.

The board members include people from BetterBe , Thales group, Rosen group, Polder Valley and Technolution.

The board members have shown a deep interest in the tool and gave valuable feedback to make the VerCors tool more applicable and efficient for industrial projects.

New PostDoc in Mercedes Project

June 3, 2019

Raúl E. Monti joined VerCors Team and started as a PostDoc on the Mercedes project.

NWO OTP grant for ChEOPS (verified Construction of corrEct and Optimised Parallel Software) Project

May 16, 2019

Prof.dr. Marieke Huisman and dr. Anton Wijs received an NWO OTP grant for the project “ChEOPS: verified Construction of corrEct and Optimised Parallel Software”.

Two PhD students will be appointed, one in Twente and one in Eindhoven, to make the development and maintenance of software aimed at graphics processing units (GPUs) more insightful and effective in terms of functional correctness and performance.

GPUs have an increasingly big impact on industry and academia, due to their great computational capabilities. However, in practice, one usually needs to have expert knowledge on GPU architectures to optimally gain advantage of those capabilities. At the Eindhoven University of Technology, Wijs will work on modelling GPU applications using a Domain Specific Language, formally verifying the correctness of the models, and automatically generating GPU code. At the University of Twente, Huisman will work on the structured optimisation of GPU code, while ensuring that functional correctness is preserved. Existing formal verification techniques, model checking and code verification, will be combined to create, for the first time, a complete end-to-end development workflow for GPU applications.

To ensure the practical effectiveness of the resulting workflow, a users committee, consisting of SURFsara, the Netherlands eScience Center, Stream HPC, and CodePlay (UK), will provide real-life cases and provide feedback throughout the project.


April 15, 2019

VerCors Team participated in ETAPS 2019 conference for VerifyThis competition, held in Parague and have won two awards.

Sophie Lathouwers and Wytse Oortwijn won the Best Student Team award!

Marieke Huisman and Sebastiaan Joosten won the “Most Distinguished Tool Feature Award” for their usage of ghost method parameters to model sparse matrices!

New PhD Candidate in Mercedes

December 3, 2018

Sophie Lathouwers started as a PhD student on the Mercedes project. Sophie will investigate the automated generation of auxiliary annotations, which are needed for program verification in VerCors.

Towards Reliable Concurrent Software

November 16, 2018

During the symposium organised for the 60th birthday of Arnd Poetzsch-Heffter, Marieke Huisman presented a position paper “Towards Reliable Concurrent Software”, co-authored with Sebastiaan Joosten, which outlines the plans of the Mercedes project.

ISoLA 2018

November 5, 2018

ISOLA 2018 features several presentations around VerCors.

Marieke Huisman presents the position paper “On Models and Code - A Unified Approach to Support Large-Scale Deductive Program Verification”.

In this paper, she argues that we need a seamless transition between models and code, and she sketches how the VerCors tool provides a first step towards this goal.

Marieke Huisman also presented the paper Program Correctness by Transformation, co-authored by Stefan Blom, Saeed Darabi and Mohsen Safari, which describes how the VerCors tool can be used to ensure that program transformations and optimisations preserve program correctness.

Finally, Sebastiaan Joosten presented Static Code Verification Through Process Models, co-authored by Marieke Huisman, which sketches an alternative approach for the use of abstractions to reason about concurrent software.

New Master Student

September 1, 2018

Minh Nguyen starts his final Master thesis project, in which he will try to verify functional correctness of a red black tree using VerCors.

Marieke Huisman, Stefan Blom (BetterBe) and Sebastiaan Joosten will supervise the project.

FTfFP 2018

July 16, 2018

The workshop FTfFP 2018 (@ECOOP 2018) features several VerCors related presentations. Wytse Oortwijn gives a tool demo of the VerCors tool set, while Sebastiaan Joosten presents the paper An Exercise in Verifying Sequential Programs with VerCors, co-authored by Wytse Oortwijn, Mohsen Safari and Marieke Huisman.

In this paper, we present our solutions to two of the VerifyThis 2018 challenges.


April 14, 2018

Two VerCors teams participated in this year’s VerifyThis program verification competition, held in Thessaloniki as part of ETAPS 2018.

Wytse Oortwijn and Mohsen Safari won the 2nd prize for the best student team.

New PhD Students in Mercedes Project

February 15, 2018

Two new PhD students started on the Mercedes project: Mohsen Safari and Fauzia Ehsan.

Mohsen’s project will contribute to further improvement of the verification of GPU programs in VerCors. Fauzia’s project will focus on the effective use of abstractions to reason about concurrent or distributed programs, using VerCors.

Marieke Huisman Inaugural Lecture

January 25, 2018

Marieke Huisman gives her inaugural lecture, entitled “Software Reliability for Everyone”.

In this lecture, she presents her view on the future of software verification research.

Booklet inaugural lecture