Globalization of law may be defined as the worldwide progression of transnational legal structures and discourses along the dimensions of extensity, intensity, velocity, and impact. We propose that a theory of the global penetration of law will require at least four elements-actors, mechanisms, power, and structures and arenas. A comparison of four approaches to globalization and law-world polity, world systems, postcolonial globalism, and law and economic development-indicates considerable variation in perceived outcomes and gaps in explanation, but with possible complementarities in both outcomes and explanatory factors. Research demonstrates that globalization is variably contested in several domains of research on law: (a) the construction and regulation of global markets, (b) crimes against humanity and genocide, (c) the diffusion of political liberalism and constitutionalism, and (d) the institutionalization of women's rights. We propose that the farther globalizing legal norms and practices are located from core local cultural institutions and beliefs, the less likely global norms will provoke explicit contestation and confrontation. Future research will be productively directed to where and how global law originates, how and when global norms and law are transmitted and enforced, and how global-local settlements are negotiated. GLOBALIZATION OF LAW 449 initially contextualized definitions, interpretations, diagnoses, frames, archaeologies, genealogies, and extrapolations in accord with the universality inherent in the globalization discourse. An arena may be said to be globalized when there is a coincidence of structural and discursive elements. Variation in the advance of globalization occurs in both structural and discursive elements, which may be arrayed along dimensions of extensity (i.e., breadth of inclusion of nation-states, policy domains within states), intensity (i.e., how deeply a global influence penetrates inside states, societies, and consciousnesses), velocity (i.e., how rapid the flow of a globalizing content), and impact (i.e., the degree of change effected directly or indirectly by a global encounter) (Held et al. 1999). Thus, a highly globalized domain includes structural changes that are fast moving and extensive and that penetrate intensively into a society with strong impact. A highly globalized domain is dominated by discourses that are universalized and that obtain consensus deep within adopter societies.