Informed by the core insight that, in technology and engineering, factual knowledge relating, for example, to the properties of materials or the load-bearing characteristics of differing construction designs is not enough, this analysis follows the often unseen foundations upon which technologies rest-the norms that guide the creative forces shaping the technical landscape to come. The book, a comprehensive survey of these emerging topics in the philosophy of technology, clarifies the role these norms (epistemological, functional, and risk-assessing) play in technological innovation, and the consequences they have for our understanding of technological knowledge.