This book constitutes the refereed proceedings of the 12th International Conference on
Mathematics of Program Construction MPC 2015 held in Königswinter Germany in June July
2015. The 15 revised full papers presented together with two invited talks were carefully
reviewed and selected from 20 submissions. The papers are about mathematical methods and tools
put to use in program construction. They range from algorithmics to support for program
construction in programming languages and systems. Some typical areas are type systems program
analysis and transformation programming-language semantics security and program logics.
