
Maastricht Montesquieu Institute
Dear visitor, as of 1 September 2025 Maastricht Montesquieu Institute (MMI) is no longer active.
This means this website will not be updated anymore. The website will remain online to keep our research, conducted throughout the years, available.
You can find more informationhere.
Fast facts
- European and comparative study of liberal democracies, parliamentary systems and the rule of law
- participates in the interuniversity Montesquieu institute
- main seat: Maastricht Faculty of Law
- led by Prof. Joost Sillen
The Maastricht Montesquieu Institute (MMI) is a research centre dedicated to European and comparative parliamentary studies. Montesquieu's 'formula' for the organisation of a sustainable and democratic society has to a large extent determined the organisation of many 'modern' parliamentary democracies. However, this formula provides some challenging questions: is it still applicable nowadays? One of the objectives of the inter-university Maastricht Montesquieu Institute is to stimulate both Dutch and foreign scientiok for answers to this kind of questions. It is a collaboration between, amongst others, UM, Leiden University and the University of Groningen.
Research
The Maastricht Montesquieu Institute focuses on parliamentary systems of government in Europe and in the European Union, on aspects of separation of power, democracy and the rule of law and human rights. The Institute’s aim is to contribute to the academic and public debate on democracy and governance in the European Union and its member-states by deepening the understanding of the constitutional structures and political practice of national systems of parliamentary government and rule of law and democracy. It takes a thoroughly comparative approach to parliamentary studies in a European context and analyses national systems in a vertical multi-layered perspective.
With its focus, the constitutional law research is well suited to the faculty and university themes related to globalisation, Europeanisation and comparative law, as laid down in the two research streams about Values and Institutions.
Visit MMI's research

MMI's research mainly takes place in the following streams:
1. Values
2.Institutions
MMI news
Maastricht Montesquieu Institute (MMI) to be discontinued as of 1 September 2025

Appointment of Dr Joost Sillen as Professor of Constitutional Law

Research grant for Monica Claes and Maarten Stremler
- UM news

National parliaments in the European Union

Conflict or Concord?

MMI blogs
The fragility of the familiar: how Boris Johnson exposed the tenuous nature of the UK Constitution
- Law
“Life happens when you are busy making plans”, John Lennon once said. To his chagrin, Boris Johnson, who was counting on winning a third term (despite only being two years into his first), realized that Lennon certainly had a point there. What we witnessed in frenzied television reports from London was both the normality and the abnormality of politics.

House of Cards: when your worst enemy is one of your own
- Law
In the 1980s, in the heyday of Thatcherism, Scottish actor Ian Richardson starred in the leading role of Francis Urquhart in the BBC series House of Cards. In it, Urquhart, who starts out as the Chief Whip for the Conservative government led by Thatcher’s fictional successor, schemes against and manipulates his fellow MPs in order to emerge as Prime Minister of the United Kingdom. Indeed, it was this BBC version that provided the blueprint for the eponymous US Netflix drama that was all the rage during the Obama Years.

Johan Rudolph Thorbecke
- Law
(1798-1872). Dutch liberal statesman. Drafted the 1848 revision of the Dutch Constitution that established the parliamentary system.

Montesquieu
- Law
Since the educational spaces in our faculty have all been named, we would like to tell about the background of the elected jurists and cases. Through a series of blogs we want to make the names come to life and show that our building houses a legal faculty. After all, not everyone knows all the ins and outs of these persons and cases. What makes them so special? Several colleagues will talk about these individuals and cases in the coming months. In this second edition you can read all about Montesquieu.

Choreography of sound and fury: The federal constitutional court’s recent PSPP judgment
- Law
The recent verdict (“the PSPP judgment”) of the German Federal Constitutional Court (“FCC”) on the compatibility of the Public Sector Purchase Programme (“the Programme”) under the management of the European Central Bank (“ECB”) has attracted plenty of commentary, much of it critical concerning the reasoning of the judgment. The following contribution shall attempt to contextualize the PSPP judgment in the framework of the FCC’s historical jurisprudence and seek to gain an initial understanding whether the judgment does indeed represent a threat to the legal order of the European Union (“EU”).

MMI's recent publications
- de Visser, M., Leijten, I., de Poorter, J., Van der Schyff, G., Stremler, M., & Vonk, S. (Eds.) (2025).Varieties of Constitutionalism. TMC Asser Press. European Yearbook of Constitutional Law Vol. 6https://doi.org/10.1007/978-94-6265-699-4More information about this publication
- van Hout, F. (2025).Demissionair doorregeren: de uitzondering die de (vertrouwens)regel bevestigt.De Hofvijver,15(168).https://www.montesquieu-instituut.nl/id/vmq4ei03yyut/nieuws/demissionair_doorregeren_de_uitzonderingMore information about this publication
- van der Sluis, M. (2025).Who needs accountability? The limited usefulness of accountability for researching the ECB.Zeitschrift für Europarechtliche Studien,28(2), 310-334.https://doi.org/10.5771/1435-439X-2025-2-310More information about this publication
- Sillen, J. (2025).Vrijheid van meningsuiting en official speech in het parlement: Over de toepassing van grondrechten in nieuwe rechtsverhoudingen. In B. Arrass, L. C. Groen, F. J. van Ommeren, A. E. van Rooij, & S. E. Zijlstra (Eds.),De orde overzien: Opstellen voor prof. mr. A.E. Schilder(pp. 283-293). Wolters Kluwer.https://www.inview.nl/document/idb97b88c0f3a04e5898c75c44159e2281?ctx=WKNL_CSL_3286More information about this publication
- Salman, R., Hamdi, M. A. A., Riswati, R., & Hardt, S. (2025).Non-Judicial Activities of the Indonesian Constitutional Court: Do They Foster Judicial Reputation?Volksgeist Jurnal Ilmu Hukum Dan Konstitusi,8(1), 231-261.https://doi.org/10.24090/volksgeist.v8i1.12239More information about this publication
- Trifunović, J. (2025).May it please the rule of law? A comparative study into the scope and desirability of independent judicial research in contemporary criminal trials. [Doctoral Thesis, Maastricht University]. Maastricht University.https://doi.org/10.26481/dis.20250508jtMore information about this publication
- Vissers, N. (2025).Het grondwettelijk hof als geschilbeslechter bij verkiezingen?De Hofvijver,15(164).https://www.montesquieu-instituut.nl/9394000/1/j9vvllwqvzjxdyx/vmmsdbg0a2kk?pk_campaign=hofv-2504&pk_kwd=vmmsdbg0a2kkMore information about this publication
- Peirone, F. (2025).The Commission’s Annual Rule of Law Report: Three Transformative Shifts in the Oversight of EU Member States.Review of European Administrative Law,18(1), 9-33.https://doi.org/10.7590/187479825X17412660273082More information about this publication
- Aarts, K., Leenknegt, G.-J., & van Vugt, E. (2025).Factsheet nieuw kiesstelsel met kiesdistricten en vereffeningszetels. Parlement en Wetenschap.https://parlementenwetenschap.nl/wp-content/uploads/2025/03/250305_Factsheet_nieuw_kiesstelsel_Aarts_Leenknegt_Van_Vugt.pdfMore information about this publication
- Sillen, J. (2025).Notitie rondetafelgesprek - Sociale grondrechten. Maastricht University, Faculty of Law.More information about this publication
- Angiolini, C., & Peirone, F. (2025).Pratiche Commerciali Sleali: Studio a tutela della concorrenza nelle filiere agroalimentari. Lefebvre Giuffrè.https://shopdata.giuffre.it/media/estratti/ESTRATTO_024224992.pdfMore information about this publication
- Vissers, N. (2025).Democratische vernieuwing of vertekening? De risico’s van een Zweeds/Deens stelsel. In Montesquieu Instituut (Ed.),Overwegingen voor een nieuw kiesstelsel(pp. 28-29). Montesquieu Instituut .More information about this publication
- van Vugt, E. (2025).Aletta Jacobs: zaak verloren, strijd gewonnen. Web publication/site, Ministerie van Binnenlandse Zaken en Koninkrijksrelaties.https://www.nederlandrechtsstaat.nl/vrouw-en-rechtsstaat-3-aletta-jacobs-zaak-verloren-strijd-gewonnen/More information about this publication
- Stremler, M., & Vissers, N. (2025).Het Europese Hof van Justitie als hoeder van de Nederlandse democratie?. Web publication/site, Nederland Rechtsstaat.https://www.nederlandrechtsstaat.nl/het-europese-hof-van-justitie-als-hoeder-van-de-nederlandse-democratie/More information about this publication
- McGoldrick, D., & DeCock, M. (2025).Assessing Public Morality and the Necessity of Restrictions on ECHR Rights.European Human Rights Law Review,2025(1), 34-59.More information about this publication
- Imamovic, Š. (2025).Democracy and the rights of representation in the case law of the European Court of Human Rights. In M. Belov (Ed.),Representative Democracy in Flux: Deconstructive Narratives from a Legal and Constitutional Perspective(pp. 253-273). Taylor and Francis.https://doi.org/10.4324/9781003610670-15More information about this publication
- Heringa, A. W., Stremler, M., & van der Sluis, M. (2025).Grondrechten. In F. Fernhout (Ed.),Het Nederlandse recht: Een Maastrichtse inleiding(2025 ed., pp. 251-270). Uitgeverij Gianni.More information about this publication
- Sillen, J. (2025).Mag de bestuursrechter wél de procedure van totstandkoming van wetten toetsen?Ars Aequi,mei, 378-383. Article AA20250378.More information about this publication
- van den Berg, J. (2024).Wat mag een staatsraad wel en wat niet?. Web publication/site, Ministerie van Binnenlandse Zaken en Koninkrijksrelaties.https://www.denederlandsegrondwet.nl/id/vmjje9mtkus5/nieuws/wat_mag_een_staatsraad_wel_en_wat_niet?colctx=vhxgpc5fb7yk&start_002=76More information about this publication
- Peirone, F. (2024).Time Clash: the Court of Justice Limits the Temporal Scope of Lex Mitior.European Constitutional Law Review,20(4), 593-614.https://doi.org/10.1017/S1574019624000361More information about this publication