Making a Difference presents fifteen original essays on causation and counterfactuals by philosophers and political theorists. Collectively, they represent the state of the art on these topics. The essays in this volume are inspired by the work of the late Australian philosopher Peter Menzies (1953–2015), who himself made a very great difference to our contemporary understanding of these matters. Topics covered include: the semantics of counterfactuals, agency theories of causation, the context-sensitivity of causal claims, structural equation models, mechanisms, mental causation, the causal exclusion argument, and free will. Contributors: Helen Beebee, Thomas Blanchard, David Braddon-Mitchell, Rachael Briggs, Nancy Cartwright, Christopher Hitchcock, Christian List, Cei Maslen, Peter Menzies, Daniel Nolan, Philip Pettit, Huw Price, Jonathan Schaffer, Brad Weslake, James Woodward.