Abstract State Machines, Alloy, B, VDM, and Z [electronic resource] : Third International Conference, ABZ 2012, Pisa, Italy, June 18-21, 2012. Proceedings / edited by John Derrick, John Fitzgerald, Stefania Gnesi, Sarfraz Khurshid, Michael Leuschel, Steve Reeves, Elvinia Riccobene.