This book is a concise practical guide to some of the most relevant ways of thinking and doing international legal research today. It is designed to help students and early career researchers to get acquainted with the theory and practice of a selection of non-doctrinal modes of legal research that include feminist international law, critical international law and TWAIL, complemented with qualitative methods of empirical legal research. The book also encourages a meaningful dialogue with traditional doctrinal styles of legal research. The book’s most innovative aspect is its practical, learner-centred approach, which focuses on the applied learning of the modes of research presented.