Terrorist groups adapt to environmental changes to maintain power. This project provides new insights by developing a theory of strategic target selection and using big data analytics and machine learning to test these hypotheses.

How to explain variation in the extent to which parliamentary voting behaviour follows the government–opposition divide? Party Politics article by Tom Louwerse et al.

Behavioral and neural mechanisms underlying risky decision-making in adolescents

The leading textbook on governance and politics in the Netherlands. The authors offer a clear and comprehensive account and have revised the text to provide full coverage of recent important developments.

In this project, researchers from computer science, law, psychology, and public administration research in practice how artificial intelligence (AI) can be leveraged to make decision-making in the security domain more effective, while also keeping it safe and accountable.

The car we buy is made out of thousands of components, which are produced using different types of materials. These materials need to be sourced from different places, sent to production facilities and assembled. Once the car is dismissed, the components need to be taken care of by either reusing, recycling…

This article by Danielle Goldwert, Sara Constantino, Jaroslaw Kantorowicz and colleagues presents one of the largest behavioral 'megastudies' to date, testing how different interventions can stimulate public, political and financial climate advocacy.

The lecture series “Humanity in the Automated State” held its second session on January 12, 2026, at Leiden Law School. Dr. Aya Rizk from Linköping University brought her expertise on Information Systems whit a focus on how digital technologies and data drive organizational change, particularly in decision-making…

Promotor: J.M. van den Broek Co-promotor: M.C. de Vries

This article investigates which factors most influence individuals’ decisions to engage in conversations about risk.

(1) What are the institutional factors that influence AI adoption and implementation? and (2) How does AI reshape the exercise of administrative discretion within public organisations, and how do adoption and implementation choices moderate these effects?

Jan de Vetten brengt zijn promotieonderzoek ook uit in boekvorm. ‘In de ban van goed en fout’ beschrijft voor het eerst - op basis van archiefonderzoek en interviews - op samenhangende wijze de bestrijding van de CP en CD, en ook de reactie daarop van die partijen. Waarom werden ze zo fel werden bestreden?…

A recent publication by Niek Strohmaier, Assistant Professor of Empirical Legal Studies (ELS) Lab @Leiden, together with Professor Jan Adriaanse, Professor Kees van den Bos and Associate Professor Helen Pluut, has been accepted by the Journal of Applied Social Psychology.

Despite being the object of intense study, embryonic development has been difficult to model due to a number of reasons. First, complex tissues can be comprised of many cell types, of which we probably only know a subset.

There is a need for alternative methods to replace, reduce and refine (3R) animal experimentation. Combining experimental data from high-throughput in vitro studies with in silico modeling is a promising approach to unravel the effect of chemicals on living cells and to gain a better understanding of…

This paper develops a novel theoretical framework for the conduct of postmortems after major foreign policy surprises for the European Union and its member states.

Humans share meaning through language. Over time, repeated interactions have shaped languages into forms that match our cognitive preferences, making them structured, expressive, easy to learn, and ultimately, meaningful.

To easily take part in group decision-making research, Jörg Gross, Assistent Professor Social and Organisational Psychology, launched a platform that allows students at the social interaction lab. Sign up to receive invitations if you are interested in taking part in on-going scientific studies in the…

Here I propose to study the relationship between autonomic pupil-synchronisation and trust, at the behavioural and neural level, and examine a targeted set of possible contextual moderators.

In 2009-2010, the notion of a more ‘assertive’ China emerged in Western discourse, a viewpoint that China vehemently rejects. Nevertheless, especially after Xi Jinping rose to power in 2012, it is clear that China has abandoned its long-held foreign policy doctrine of ‘keeping a low profile.’

A former employee of Leiden University breached academic integrity. This is the conclusion of the University’s Academic Integrity Committee in its recommendation to the Executive Board on 11 January 2019.

Professor of Constitutional Law, Wim Voermans, is surprised by the decision of PVV ministers to resign at the request of party leader Geert Wilders. Voermans says in Mr. Online that Wilders 'has no constitutional authority to do so.'

How public service motivation and professionalism affect decision-making in dilemma situations. Individuals who work in the public sector see themselves confronted with conflicting values, contradictory demands, and the need to serve an at times difficult to define ‘public interest’.

To what extent is the legislation and use of pre-trial detention of juveniles in the Netherlands in compliance with international children’s rights standards?

The association agreement between the EU and Ukraine is highly important for peace in Ukraine, and it is therefore essential that Europe weathers these difficult times. These were the words of Ukrainian President Petro Poroshenko on 27 November during his Europe Lecture at Leiden University.

Municipalities are increasingly attempting to solve problems without issuing decisions. A notification procedure (notification – investigation – application – decision) has recently been introduced that replaces part of the traditional application procedure. Ymre Schuurmans, Professor of Constitutional…

Politicians' statements often involve emotions, shaping public perceptions. This study highlights the role of emotions in EU foreign policy.

On 4 March 2021, Michiel Spanjers defended his thesis 'Belastingbudget'. The doctoral research was supervised by Prof. J.P. Boer and Prof. H. Vording.

How to make educational innovations practical for teachers

On 1 July 2020, Niek Strohmaier defended his thesis 'Making Sense of Business Failure'. The doctoral research was supervised by Prof. J.A.A. Adriaanse en dr. H. Pluut.

Political scientist Tim Mickler (Leiden University) receives a grant from The Dutch Research Council (NWO) for his quantitative research into post-parliamentary positions of parliamentarians. The grant is a result of the SGW Open Competition XS, with the aim of stimulating innovative scientific rese…

How is generative AI changing the way we learn, communicate, and make sense of the world today? As AI tools become part of everyday life, they don’t just produce text but shape meaning, influence trust, and impact how we find and share information. This project explores how people use, experience and…