Many doctrinal legal research questions require making use of other academic disciplines or perspectives. This article explains the relevance of legal philosophy for doctrinal research projects. Often legal research questions have conceptual or evaluative dimensions that presuppose philosophical understanding. For research on the concept of democracy, the function of constitutional rights, or the possible introduction of a referendum in the Netherlands, questions of a philosophical nature need to be answered. Legal philosophy can supplement and enrich doctrinal research in various ways. In this article, we present seven purposes that legal philosophy may serve in the context of a doctrinal research project: conceptual clarification, exposition and reconstruction of fundamental normative principles and values, theory building, providing creative perspectives, structural critiques, evaluation, and recommendations. For each objective, we illustrate how to use relevant philosophical methods. Thus, this article complements our earlier publication ‘Legal Philosophy as an Enrichment of Doctrinal Research – Part I: Introducing Three Philosophical Methods’.¹x http://www.lawandmethod.nl/tijdschrift/lawandmethod/2020/01/lawandmethod-D-19-00006.

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• * This text has been presented to classes at the University of Zagreb, Queen Mary University of London and Erasmus School of Law, Rotterdam; we profited from the feedback of our students. We also want to thank Irma Bluijs, Machteld Geuskens, Tamar de Waal and the reviewers for their helpful comments on previous versions of this article, and Jacqueline Brand and Robert Poll for providing research assistance.

• 1 http://www.lawandmethod.nl/tijdschrift/lawandmethod/2020/01/lawandmethod-D-19-00006.

In this article, we discuss a particular form of interdisciplinary legal research. We focus on a discipline that may be fruitfully combined with doctrinal research, namely philosophy. The aim of this article is to give an account of the methods of philosophy that are most relevant and useful for doctrinal legal scholars. Our focus is therefore mostly on legal philosophy and the philosophical subdisciplines closely related to it, such as political philosophy and ethics. We characterize legal philosophy in three complementary ways: as an activity, as insights, and as theories. We then discuss three methods of legal philosophy: argumentation analysis and construction, author analysis and reflective equilibrium. In the practice of research these three methods are usually combined, as we will show with various examples.