The essays in this volume discuss the various approaches to New Materialism in Sociology and Philosophy. They raise the questions of what New Materialism consists of and whether it in fact should be considered a radical change in Social Theory. Are the ideas of a “material turn”, as the theory is formulated and in its assumptions, foreshadowed by the classical philosophies of Spinoza and Tarde? Do these new approaches bring substantially new perspectives to Social Theory? A further goal of these essays is to formulate the methodological and methodical consequences for its empirical implementation. What conditions must an ethnography of things fulfill if it is to be sufficient? Which participant objects and bodies do the approaches of the various social theories and methodologies include or exclude?