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The authors of this volume (Ilpo Koskinen, John Zimmerman, Thomas Binder, Johan Redstrom, and Stephan Wensveen) argue that design research needs more than mathematics: it needs many other vocabularies as well, including art, cultural studies, anthropology, cognitive psychology, and communication. The book is clearly written and helpfully designed, with focused case studies and incisive cartoon-like summaries of key concepts. The reference section is extensive and truly useful: international in scope and broadly multidisciplinary. The authors, all academics, work in art, design, computer science, social science, filmmaking, engineering, and philosophy.
Koskinen et al. (Tue,) studied this question.