This document discusses the emergence of dominant designs in technological innovation. It defines a dominant design as a single product or process architecture that dominates a product category, usually capturing 50% or more of the market. Dominant designs become de facto standards for an industry. Reasons why dominant designs are selected include learning effects, prior learning and absorptive capacity, and network externalities. Learning effects refer to how a technology improves as it is adopted and used more. Prior learning builds a firm's absorptive capacity to assimilate new knowledge. Network externalities mean the value of a good increases as more users adopt it.