This chapter illustrates the central theme of this book: the functional dichotomy between Roman standards and local traditions. Standards establish the minimum level that practices, objects, documents, or other elements must meet to be acceptable or intelligible in specific contexts, which justifies their diversity and adaptability across different settings. The chapter outlines the various perspectives from which the concept of standardization is explored in the two volumes that comprise this work, describing their sections and chapters. It explains and provides examples of how this study examines the manifestations of standardization and localism in Roman law and economic practices, as well as their impact on diverse phenomena such as symbols, legal culture, and commercial practices, alongside material culture, infrastructure, and landscapes. Rather than viewing standards solely as products of Roman domination, we aim to recontextualize them as evidence of diverse socioeconomic practices and cross-cultural interactions. This chapter takes a comprehensive approach to the study of standardization in the Roman world, analyzing how Rome’s subjects engaged with the Roman legal system and how their adherence to local customs and traditions influenced these standards. Beyond the semantic considerations of what constitutes a standard in multicultural and legally plural contexts, the chapter seeks to illuminate the underlying symbolic, autonomous, and internal logic of non-state legal systems.