When Kyle Cornforth first walked into IDEO’s San Francisco offices in 2011, she felt she had entered a whole new world. At the time, Cornforth was a director at the Edible Schoolyard Project, a nonprofit that uses gardening and cooking in schools to teach and to provide nutritious food. She was there to meet with IDEO.org, a new social-impact spinoff of the design consulting firm, which was exploring how to reimagine school lunch, a mission that the Edible Schoolyard Project has been working toward since 2004. But Cornforth was new to IDEO’s way of working: a six-step methodology for innovation called design thinking, which had emerged in the 1990s but had started reaching the height of its popularity in the tech, business, and social-impact sectors.