This introductory article makes the case for studying joint institutional frameworks (JIFs) in EU bilateral agreements and provides an overview of the remaining contributions to the symposium. In doing so, it addresses contemporary policy developments and theoretical debates in political science and international institutional law. It considers the rationale, design, performance as well as legitimacy of JIFs both in general and, in particular, in the EU's contractual bilateral relations. By mapping out the variety of JIFs in distinct geographical and regulatory contexts, the article develops an overarching argument about the 'transversal' nature of such structural frameworks, focusing on the most prevalent structural principles and rules, joint bodies and special procedures, including those not covered in detail in the other contributions to this symposium.