Computing is increasingly intertwined with our physical world. From smart watches to connected cars, to the Internet of Things and 3D-printing, the trend towards combining digital and analogue materials in design is no longer an exception, but a hallmark for where interaction design is going in general. Computational processing increasingly involves physical materials, computing is increasingly manifested and expressed in physical form, and interaction with these new forms of computing is increasingly mediated via physical materials. Interaction Design is therefore increasingly a material concern. In this book, “The Materiality of Interaction – Notes on the Materials of Interaction Design”, Mikael Wiberg investigates this trend towards material interactions. In doing so he describes how the field of human-computer interaction has moved, through the material turn, from a representation-driven design paradigm, towards a paradigm which he calls material-centered interaction design. Wiberg examines what this emergent paradigm implies for the practice of doing interaction design, he proposes a design method for doing material-centered interaction design, and he discusses the implications for moving forward given an interaction design paradigm that focuses on the materiality of interaction.