The book begins with an analysis of the technological infrastructure environment and of the manifold regulatory theories developed in the Internet Governance context. Based on this foundation the transnational normative ecosystem is outlined, followed by a detailed discussion of the substantive Internet Governance principles (such as legitimacy, participation, transparency, accountability). These considerations lead to the presentation of relevant international legal concepts (duty of co-operation, global public goods, shared spaces, due diligence, State responsibility) that merit more attention. The outlook proposes potential approaches for improving the future of the Internet Governance design.