This volume consists of the proceedings of the 31th International Conference on Applications and Theory of Petri Nets and Other Models of Concurrency (PETRI NETS 2010). The Petri Net conferences serve as annual meeting places to discuss the progress in the ?eld of Petri nets and related models of conc- rency. They provide a forum for researchers to present and discuss both app- cations and theoretical developments in this area. Novel tools and substantial enhancements to existing tools can also be presented. The satellite program of the conference comprised ?ve workshops and three tutorials. This year, the c- ference was co-located with the 10th International Conference on Application of Concurrency to System Design (ACSD 2010). The two conferences shared ?ve invited speakers. Detailed information about PETRI NETS 2010 can be found at http://petrinets2010. di. uminho. pt. The PETRI NETS 2010 conference was organized by the Universidade du Minho and the Instituto Polytecnico de Beja. It took place in Braga, Portugal during June 21-25, 2010. We would like to express our deepest thanks to the Organizing Committee, chaired by Joao M. Fernandes, for the time and e?ort invested in the conference and for all the help with local organization.
We are also grateful for the ?nancial support by Centro de Ciencias e Tecnologias de Computacao. Thisyearthenumberofsubmittedpapersamountedto50,whichincluded43 full papers and 7 tool papers. The authors of the papers come from 20 di?erent countries. We thank allthe authorswho submitted their papers.