This article presents an interdisciplinary comparison of British and German legal arguments concerning the justification of the use of force against the Islamic State in Iraq and Syria (ISIS). It is situated in the broader framework of research on strategic culture and the use of international law as a tool for justifying state behaviour. Thus, a gap in political science research is analysed: addressing legal arguments as essentially political in their usage. The present work questions whether differing strategic cultures will lead to a different use of legal arguments. International legal theory and content analysis are combined to sort arguments into the categories of instrumentalism, formalism and natural law. To do so, a data set consisting of all speeches with regard to the fight against ISIS made in both parliaments until the end of 2018 is analysed. It is shown that Germany and the UK, despite their varying strategic cultures, rely on similar legal justifications to a surprisingly large extent.

This article considers how empirical legal studies (ELS) and doctrinal legal research (DLR) interact. Rather than seeing them as competitors that are methodologically independent and static, it suggests that they are interdependent activities, which may each be changed by interaction with the other, and that this change brings both opportunities and threats. For ELS, the article argues that DLR should properly be understood as part of its theoretical framework, yet in practice little attention is given to doctrine in empirical work. Paying more attention to DLR and legal frames generally would help ELS meet the common criticism that it is under-theorised and excessively policy oriented. On the other hand, an embrace of legal thinking, particularly of critical legal thinking, might lead to loss of status for ELS in policy circles and mainstream social science. For DLR, ELS offers a chance for it to escape the threat of insular sterility and irrelevance and to participate in a founded commentary on the world. The risk, however, is that in tailoring legal analysis to what can be empirically researched legal scholars become less analytically ambitious and more safe, and their traditionally important role as a source of socially relevant critique is weakened. Inevitably, in offering different ways of moving to normative conclusions about the law, ELS and DLR pose challenges to each other, and meeting those challenges will require sometimes uncomfortable self-reflection.

Studies have shown that the effects of scientific research on law and policy making are often fairly limited. Different reasons can be given for this: scientists are better at falsifying hypothesis than at predicting the future, the outcomes of academic research and empirical evidence can be inconclusive or even contradictory, the timing of the legislative cycle and the production of research show mismatches, there can be clashes between the political rationality and the economic or scientific rationality in the law making process et cetera. There is one ‘wicked’ methodological problem, though, that affects all regulatory policy making, namely: the ‘jump’ from empirical facts (e.g. there are too few organ donors in the Netherlands and the voluntary registration system is not working) to normative recommendations of what the law should regulate (e.g. we need to change the default rule so that everybody in principle becomes an organ donor unless one opts out). We are interested in how this translation process takes place and whether it could make a difference if the empirical research on which legislative drafts are build is more quantitative type of research or more qualitative. That is why we have selected two cases in which either type of research played a role during the drafting phase. We use the lens of the proportionality principle in order to see how empirical data and scientific evidence are used by legislative drafters to justify normative choices in the design of new laws.

The seriousness of the incorporation problem in interdisciplinary legal research, this article argues, depends on how legal research is understood. If legal research is understood as a single, inherently interdisciplinary discipline, the problem largely falls away. On this view, the incorporation of other disciplines into legal research is what legal academics have for the last 40 years already successfully been doing. If, on the other hand, legal research is best conceived as a multi-disciplinary field, consisting of a core discipline – doctrinal research – and various other types of mono-disciplinary and interdisciplinary research, the incorporation of other disciplines presents real difficulties. For legal academics engaged in socio-legal research, in particular, two problems arise: the practical problem of trying to address a legal professional and academic audience at the same time and the philosophical problem of trying to integrate the internal perspective of doctrinal research with the external perspective of other disciplines. In the final part of the article, these practical and philosophical difficulties are illustrated by reference to the author’s research on the politics of judicial review in new democracies.

The paper offers a legal theoretical analysis of the disciplinary character of the contemporary practice of legal scholarship. It is assumed that the challenges of interdisciplinary engagement are particularly revealing about the nature of legal scholarship. The paper argues for an understanding of legal scholarship that revolves around cultivating doctrinal knowledge about law. Legal scholarship is characterised as a normative and interpretive discipline that offers an internalist and non-instrumentalist perspective on law. The paper also argues that interdisciplinary engagement is sometimes necessary for legal scholars because some concepts and ideas built into the doctrinal structures of law cannot be made fully intelligible by way of pure normative legal analysis. This point is developed with the help of an epistemological clarification of doctrinal knowledge and anchored in an account of the practice of legal scholarship. The paper explores the implications of this account by way of analysing three paradigms of interdisciplinary engagement that respond to distinctive challenges facing legal scholarship: (1) understanding better the extra-legal origins of legal ideas, (2) managing discursive encounters that can generate frictions between disciplinary perspectives, and (3) building the knowledge base to handle challenge of validating policy initiatives that aim at changing the law. In different ways, all three challenges may require legal scholars to build competence in other disciplines. The third paradigm has particular relevance for understanding the methodological profile of legal scholarship. Legal scholarship is the only discipline with specific focus on how the social environment affects the doctrinal structures of law.

The article takes as its point of departure some of the author’s multidisciplinary projects. Special attention is given to the question of whether the disciplines united in the various research team members already constituted a kind of ‘inter-discipline’, through which a single object was studied. The issue of how the disciplinary orientations of the research team members occasionally clashed, on methodological issues, is also addressed.
The outcomes of these and similar multidisciplinary research projects are followed back into legal practice and academic legal scholarship to uncover whether an incorporation problem indeed exists. Here, special attention will be given to policy recommendations and notably proposals for new legislation. After all, according to Van Dijck et al., the typical role model for legal researchers working from an internal perspective on the law is the legislator.
The author concludes by making a somewhat bold case for reverse incorporation, that is, the need for (traditional) academic legal research to become an integral part of a more encompassing (inter-)discipline, referred to here as ‘conflict management studies’. Key factors that will contribute to the rise of such a broad (inter-)discipline are the changes that currently permeate legal practice (the target audience of traditional legal research) and the changes in the overall financing of academic research itself (with special reference to the Netherlands).

There is a distinct place for legal doctrinal methods in legal-interdisciplinary research methodologies, but there is value to be had in expounding that place – in developing a deeper understanding, for instance, of what legal doctrinal analysis has to offer, wherein lies its limitations, and how it could work in concert with methods and theories from disciplinary areas other than law. This article offers such perspectives, based on experiences with an ‘advanced’ legal-interdisciplinary methodology, which facilitates a long-term study of the growing body of practice generated by citizen-driven, independent accountability mechanisms (IAMs) that are institutionally affiliated with multilateral development banks. The article demonstrates how legal doctrinal methods have contributed towards the design and development of a multipurpose IAM-practice database. This database constitutes the analytical platform of the research project and also facilitates the integration of various types of research questions, methods and theories.

The doctrinal methodology is in a period of change and transition. Realising that the scope of the doctrinal method is too constricting, academic lawyers are becoming eclectic in their use of research method. In this transitional time, legal scholars are increasingly infusing evidence (and methods) from other disciplines into their reasoning to bolster their reform recommendations.
This article considers three examples of the interplay of the discipline of law with other disciplines in the pursuit of law reform. Firstly the article reviews studies on the extent of methodologies and reformist frameworks in PhD research in Australia. Secondly it analyses a ‘snapshot’ of recently published Australian journal articles on criminal law reform. Thirdly, it focuses on the law reform commissions, those independent government committees that play such an important role in law reform in common law jurisdictions.
This examination demonstrates that while the doctrinal core of legal scholarship remains intact, legal scholars are endeavouring to accommodate statistics, comparative perspectives, social science evidence and methods, and theoretical analysis, within the legal research framework, in order to provide additional ballast to the recommendations for reform.