Technology is critical to international development, but the theory and practice of leveraging technology for humanitarian goals is not well developed. Technology Seeding is thus presented as a comprehensive model that draws upon proven design and technology transfer scholarship. Key characteristics include (i) design as the point of intervention, (ii) the building of technology from first principles (both scientific and disciplinary) and (iii) local adaptation. A case study that led in part to the methodology's development is presented. Technology Seeding, which enables and empowers the marginalized, is shown to be well suited for socially just long-term sustainable development. Copyright © 2012 John Wiley & Sons, Ltd.