The goal of this book is to bring together an anthology of some of the major theories and models of design that have emerged in the last 50 years of the relatively young discipline of design research. Another goal is to bring together the highlights of the discussions that took place during a workshop that was organised around the theories and models-The International Workshop on Models and Theories of Design (IWMT 2013) held at the Centre for Product Design and Manufacturing, Indian Institute of Science, Bangalore, India, during 3-5 January 2013.The contributions in this book cover three related, but distinct aspects of research into theories and models of design-philosophical, theoretical, and empirical. Even though by no means complete, taken together the contributions and the workshop outcomes showcase the rich but varied tapestry of thoughts, concepts and results. At the same time, they highlight the effort still required to establish a sound theoretical and empirical basis for further research into design.