Arising from the need to go beyond the semiotic, cognitive, epistemic and symbolic reading of diagrams, this book looks at what diagrams are capable of in scholarly work related to the social sciences. Rather than attempting to define what diagrams are, and what their dietic capacity might be, contributions to this volume draw together the work diagrams do in the development of theories. Across a range of disciplines, the chapters introduce the ephemeral dimensions of scientist's interactions and collaboration with diagrams, consider how diagrams configure cooperation across disciplines, and explore how diagrams have been made to work in ways that point beyond simplification, clarification and formalization.