Design thinking

The intellectual lineage begins with Herbert Simon's 1969 book The Sciences of the Artificial, in which he argued that design was not merely an artistic activity but a general approach to formulating and solving problems. Simon introduced the concept of "satisficing," seeking solutions that are good enough rather than theoretically optimal, a principle that would later become central to design thinking methodology. At Stanford University, engineer John E. Arnold had been teaching creative problem-solving methods since the 1950s, laying groundwork that his successors Robert McKim and Rolf Faste would develop into courses on "design thinking as a method of creative action."

Peter Rowe, then director of urban design programs at Harvard, published Design Thinking in 1987, the first significant use of the term as a book title. His focus was architectural, but the concept was expanding. In 1991, David Kelley co-founded IDEO in Palo Alto, California, with Bill Moggridge and Mike Nuttall. Throughout the 1990s, IDEO refined a human-centered design process built around empathy with users, rapid prototyping, and iterative testing, winning more design awards than any other firm. Business scholars at Stanford and Harvard began studying IDEO's methods, identifying brainstorming culture and knowledge brokering as key mechanisms behind the firm's consistent output of innovative products.

In 2005, Kelley co-founded the Hasso Plattner Institute of Design at Stanford, known as the d.school, which formalized design thinking into a five-stage framework: empathize, define, ideate, prototype, test. The d.school brought together students from engineering, business, medicine, and law, positioning design thinking as a universal problem-solving methodology rather than a discipline-specific skill. Tim Brown, who became IDEO's CEO in 2000, published Change by Design in 2009, extending the framework into corporate strategy.

Critics, including design scholars Lucy Kimbell and Lee Vinsel, have argued that the popularized version oversimplifies the cognitive complexity that Simon and other researchers originally described. The methodology nonetheless became standard curriculum at business schools worldwide, and its language of empathy, iteration, and prototyping entered the vocabulary of organizations from the World Bank to the U.S. Department of Veterans Affairs.