The Faculty of Social and Behavioural Sciences brings together high-quality research and outstanding teaching in the disciplines of cultural anthropology, education and child studies, political science, psychology, science and technology studies, as well as in multidisciplinary approaches.

What are the developmental pathways to social anxiety (disorder), the causal processes and maintaining factors? How do these factors interact in the development of social anxiety disorder? How can this knowledge be used to design and implement effective preventive intervention programs for youth?

When and how does social anxiety develop? How can it go astray in some adolescents? How can we help troubled young people to attend school regularly and return to a normal developmental pathway?

Most of the vast Tibetan literature was authored by monks. They were Buddhists par excellence, educated in a system in which Indic- and Indian-inspired texts played a pivotal role. What they wrote was primarily religious or philosophical in nature, but also extended to ‘secular’ topics. Through the…

As our society becomes increasingly complex, it is critical that we better understand how we can deal with fundamental issues such as societal and personal security, and resilience against threats to our security.

Is willingness to receive Covid-19 vaccine affected by social relationships? To what degree do relationships convey information, social pressure and role-models that alter individual’s willingness to be vaccinated?

In the specialisation Social and Organisational Psychology, part of the Master in Psychology, you study behaviour in formal and informal groups, such as sports or work teams.

An analysis of pot decoration and hut distributions from the Central European Neolithic communities of Elsloo and Hienheim.

On 1 October 2019, Emile Cammeraat defended his thesis 'Economic Effects of Social Protection'. The doctoral research was supervised by Prof. K.P. Goudswaard and Prof. P.W.C. Koning.

How can we assist Universitas Indonesia's department of International law to improve their educational and applied research programs on Transnational Law, Asset Recovery and International Investment Arbitration, with an eye on Indonesia’s security and rule of law reform agenda and the needs of the…

Which laws govern the commercial use of outer space? Are States responsible for mitigating space debris? Who is liable for accidents that happen onboard an the aircraft? In our Advanced Master Air and Space Law you will learn how to deal with questions like these from both an international and a European…

Which laws govern the commercial use of outer space? Are States responsible for mitigating space debris? Who is liable for accidents that happen onboard an the aircraft? In our Advanced Master Air and Space Law you will learn how to deal with questions like these from both an international and a European…

Inequality and violence are the two biggest issues in South Africa. What is the underlying cause? Could they be linked to rivalling groups, economic factors, government policy or all of the above? To understand social issues, it is important to study them within their context. The extended case study…

This project studies social distance—the degree of sympathetic understanding that exists between people—in relation to state foreign policy making. Does, and if so how does, social distance shape political biases, aid narratives, and, ultimately, state foreign policy priorities and decisions?

What is the neural basis of social decision-making across childhood, adolescence and adulthood and what are the developmental patterns in terms of behavior and brain activation?

State utilization of 'hukum adat' and its implication for the Indonesian rule of law

Leiden University’s Master of International Civil and Commercial Law (L.L.M.) examines the interrelated layers of hard law, soft law, and relevant case law.

Law and peace in the work of Hans Kelsen. A re-evaluation of Kelsen’s legal philosophy: legal pacifism as tacit meaning of his Pure Theory of Law

International organisations that represent collaborations between States are becoming increasingly more powerful, and they have an increasing impact on our daily lives. For example, the European Court of Human Rights in Strasburg established that minors have a right to legal aid immediately following…

The Duke-Leiden Institute in Global and Transnational Law is a one-month programme providing a strong foundation for those interested in international and comparative law as well as for those planning to study law in the United States. The programme will focus on subjects such as trade agreements, human…

Growing public backlash against international organizations (IOs) and attacks of national political elites on the rule of law increasingly challenge governance by IOs.

The starting point for this research project is the notion that the human brain is susceptible to all kinds of fallacies and biases that affect our perceptions and influence our reasoning outside of our conscious awareness. Indeed, most people think they are merely observing facts and that they process…

On Wednesday 13 December 2017 Jaap Wieland defended his doctoral thesis entitled ‘De bescherming van concurrentiebelangen in het bestuursrecht’ (the Protection of Competition Interests in Administrative Law).

What are the main issues leading to polarisation and division? What is the role of social exclusion in these processes? How can we inform and design better policies to safeguard young people from falling prey to intolerance and polarisation? The DRIVE project, led by Leiden University in The Hague,…

What are the rights of migrants in Morocco and how do this receiving state and migrants deal with them in practice?

Can positive peer feedback break the cycle of negative self-relevant cognitive processes and reduce self-reported anxiety in early adolescents?

The International Institute of Air and Space Law (IIASL) offers PhD candidates the possibility to enroll in the IIASL PhD Track. It is designed for 'external' PhD candidates (buitenpromovendi), who seek to pursue a PhD in Air Law or Space Law while honouring their professional commitments in paralle…

May the Netherlands deny access to products manufactured under poor working conditions? And can a manufacturer bring a case against a country that increases its minimum wage? PhD candidate Ruben Zandvliet examined the legal and ethical issues involved in international commercial law, investment law…

Have you experienced or witnessed unacceptable or transgressive behaviour? The University has a page that gives information about what you can do yourself and which ‘helplines’ can assist you in this situation.

On Thursday 11 May 2017, Qiang Yu defended his doctoral thesis ‘Market Power and Competition Law in the Software Industry’. The supervisors of the research are Professor T.R. Ottervanger and Professor S.C.G. Van den Bogaert. A brief summary of his thesis is provided below.

Also including: Wateringen 4 & Acquiring a taste.

Day-to-day activities are important in the development of social identities, the establishment of social standing, and the communal understanding of societal rules. This perspective is broadly referred to as practice theory and relates to the power of an overarching social structure and the individual…

Social, Economic and Organisational Psychology focuses on the application of scientific psychological knowledge of social processes within and between groups of people and individuals, in organisations, but also during economic and consumer decisions.

On 14 September, Erik Plas defended the thesis'Material amendments to public contracts in public procurement law'. The doctoral research was supervised by Jan Hebly and Bart Krans.

On 9 April 2019, Yudan Tan defended her thesis 'The Rome Statute as Evidence of Customary International Law'. The doctoral research was supervised by Prof. dr. W.A. Schabas.