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.