  This volume contains the proceedings of the Twelfth International Workshop on
the ACL2 Theorem Prover and Its Applications, ACL2'14, a two-day workshop held
in Vienna, Austria, on July 12-13, 2014. ACL2 workshops occur at approximately
18-month intervals and provide a major technical forum for researchers to
present and discuss improvements and extensions to the theorem prover,
comparisons of ACL2 with other systems, and applications of ACL2 in formal
verification. These proceedings include 13 peer reviewed technical papers.
  ACL2 is a state-of-the-art automated reasoning system that has been
successfully applied in academia, government, and industry for specification
and verification of computing systems and in teaching computer science courses.
In 2005, Boyer, Kaufmann, and Moore were awarded the 2005 ACM Software System
Award for their work in ACL2 and the other theorem provers in the Boyer-Moore
family.
