Book excerpt: Design Practice Research at RMIT University is a longstanding program of research into what venturous designers actually do when they design. It is probably the most enduring and sustained body of research of its kind: empirical, evidence-based and surfacing evidence about design practice. This first Pink Book documents some of its past achievements. It is probably the most enduring and sustained body of research of its kind: empirical, evidence-based and surfacing evidence about design practice. It is a growing force in the world, with a burgeoning program of research in Asia, Oceania and Europe. This book documents some of its past achievements. Two kinds of knowledge are created by the research. One concerns the ways in which designers marshal their intelligence, especially their spatial intelligence, to construct the mental space within which they practice design. The other reveals how public behaviours are invented and used to support design practice. This new knowledge combined is the contribution that this research makes to the field of design practice research.