Since I heard an interview of Iyengar on the Hidden Brain podcast, I wanted to learn more about how she teaches creative problem-solving. She starts with the standard steps: identify a big problem that you care about, define criteria for evaluating solutions, and break the big problem into smaller sub-problems. Then for the ideation phase, she tells the story of engineer Lloyd Trotter, which was new to me. At General Electric, Trotter accelerated institutional learning among manufacturing plants by arranging for managers of high-performing plants to mentor managers of lower-performing plants. Iyengar formalizes this process of learning from precedents: For each subproblem identify successful precedents both inside and outside the problem domain, then copy strategically. She replaces standard networking, which produces many low-quality conversations, by "idea-working," which produces a few high-quality conversations with people involved in those successful precedents. This structured ideation process is the main contribution of the book. Remarkably, although blind, Iyengar uses visual examples from paintings and sculptures to illustrate her ideas.