In light of the imminent arrival of ambient intelligence and smart textiles, the design of computational and textile things are rapidly converging. Substantial attention is directed towards the new technical possibilities of these new materials, but less effort seems to be put into the challenging task of re-thinking the use of textiles and computational technology as design materials on the basis of the complex mixture of traditions, perspectives, concepts and methods that result from such convergence. These challenges and opportunities inspired the IT+Textiles design research program. Trying to dissolve the distinction between technologies and design materials, we have combined textile and interaction design, textile and electrical engineering, philosophy and the behavioural sciences to find new approaches to issues of use and context, form and aesthetics, practice and theory. In this book, we describe the collection of materials, examples, methods and concepts we have developed in our investigation of this emerging design space. IT+Textiles is a design research program led by the Interactive Institute and Newmad Technologies in collaboration with academic and industrial partners in Sweden, and is funded by VINNOVA (the Swedish Agency for Innovation Systems). This is a reprint of the book published in 2005 by IT Press/Edita.