In 1973, economist E. F. Schumacher published Small Is Beautiful, which introduced a mainstream audience to his theory of "appropriate technology": the belief that interational development projects in the Global South were most sustainable when they were small-scale, decentralized, and balanced between the traditional and the modern. His theory gained widespread appeal, as cuts to the foreign aid budget, the national interests of nations seeking greater independence, postcolonial activism, and the rise of the United States' tech sector drove stakeholders across public and private institutions toward cheaper tools. Developing to Scale tells the history of appropriate technology in international health and development, relating the people, organizations, and events that shaped this consequential idea. Heidi Morefield examines how certain technologies have been defined as more or less "appropriate" for the Global South based on assumptions about gender, race, culture, and environment. Her study reveals how policymakers wielded this tool to scale the practice of global health through the development and distribution of small-scale technologies.