In 1987, Peter G. Rowe published his pioneering book Design Thinking. In it, he interrogated conceptual approaches to design in terms of both process and form. Thirty years later, in a lecture at the Harvard University Graduate School of Design, Rowe offered a reappraisal of his earlier work, describing ways in which the capacities of the digital age have changed the way we perceive and understand creative problem-solving in architectural design.