We describe a developing methodology called ‘de- computation’ which combines design making and computational thinking in a two-way exchange aimed at understanding and reacting against increasing computational control of humans’ natural, arti cial and social systems, by using the tools and methods of computation in the design process. The steps of de-computation are detailed, its relation to similar approaches is explained, examples are given, and we explain its relevance for design research, theory construction and practical design work.