This volume contains the collection of symposium papers presented at the Philosophy of Science Association Meeting in Montreal, November 4–6, 2010, selected for publication. The volume also contains Nancy Cartwright's presidential address at the 2010 PSA. The huge amount of work required to referee all these submissions was carried out by the PSA 2010 Program Committee: Craig Callender, David Danks, Heather Douglas, Marc Ereshefsky, Branden Fitelson, Roman Frigg, Nicholas Huggett, James Joyce, Ron Mallon, Wayne Myrvold, Samir Okasha, Julian Reiss, Margaret Schabas, Robert Skipper, David Stump, Martin Thomson-Jones, and J. D. Trout. These committee members were brought back to work on this project after more than a year layoff. I cannot thank them enough for this final round of hard work they provided for the Philosophy of Science Association.

I relied on Gary Hardcastle, PSA secretary, for help and support during this, the last phase of PSA 2010, and again he was generous with both; thanks Gary. Jeff Barrett and Jim Weatherall at Philosophy of Science set me up with their Editorial Manager system for the task of refereeing the symposium papers and provided me with invaluable advice and support throughout; thank you both. The hard work on the production of this volume was also carried out at the offices of Philosophy of Science, and I thank Jim Weatherall for all his efforts on this phase of the project.

I take this opportunity to thank past president Nancy Cartwright and the governing board again for giving me the opportunity to put together the conference and this volume. I want to thank the PSA 2010 symposiasts for submitting the excellent papers that make up this volume and for their very quick turn around of their papers after acceptance to meet our publication deadline.