ACL2 Workshop 2020 Call for Papers

ACL2 2020
16th International Workshop on the ACL2 Theorem Prover and Its Applications

May 28-29, 2020. Austin, Texas, USA.

The 2020 ACL2 Workshop will be held in Austin, Texas, USA. We invite ACL2 users, experts and beginners alike, users of other theorem provers, and persons interested in the applications of theorem proving technology to submit papers to the Workshop.

Important Dates

Abstract Submission: January 31, 2020
Paper Submission: February 20, 2020
Author Notification: March 21, 2020
Camera-Ready Copy: April 24, 2020
Workshop: May 28-29, 2020

Aims and Scope

The ACL2 Workshop series is the major technical forum for users of the ACL2 theorem proving system to present research related to the ACL2 theorem prover and its applications. ACL2 is an industrial-strength automated reasoning system, the latest in the Boyer-Moore family of theorem provers. The 2005 ACM Software System Award was awarded to Boyer, Kaufmann, and Moore for their work in ACL2 and the other theorem provers in the Boyer-Moore family.

ACL2-2020 is a two-day workshop to be held in Austin, Texas, USA, on May 28-29, 2020. It is the 16th in the series of ACL2 workshops, which occur approximately every 18 months. The workshop will feature invited keynotes, technical papers, and rump sessions that discuss ongoing research.

We invite submissions of papers on any topic related to ACL2 and its applications. We strongly encourage submissions from new members of the ACL2 community, including graduate students and researchers who are primarily involved with other theorem provers or formal methods. Suggested topics include but are not limited to new results in the following areas.

  • Software or hardware verification with ACL2
  • Formalizations of mathematics in ACL2
  • Libraries and tools for ACL2
  • User interfaces for ACL2
  • Novel uses of ACL2
  • Experiences with ACL2 in the classroom
  • Reports of and proposals for improvements of ACL2
  • Comparisons with other theorem provers
  • Comparisons with other programming or specification languages
  • Challenge problems and their solutions
  • Foundational issues related to ACL2
  • Implementations connecting ACL2 with other systems

Paper Submissions

Submissions must be made electronically in PDF format. and they should be prepared in the EPTCS templates, available from All papers must be submitted via EasyChair at

The ACL2 Workshop accepts both long papers (up to sixteen pages) and extended abstracts (up to two pages). Both categories of papers will require short abstracts to be submitted by the "Abstract submission" deadline and will be refereed by at least two members of the program committee. Accepted submissions in both categories will be included in the final workshop proceedings, although speaking slots will be shorter for extended abstracts. At least one author of each accepted submission must register for the workshop and give a presentation summarizing the paper's results.

Extended abstracts should contain at least one or two references so interested readers can pursue the abstract topic. Long papers and extended abstracts must describe work that has already been done, not simply ideas for future work. Current and planned (or suggested) work may be presented in the Rump Session.

One of the main advantages of the ACL2 Workshop is that attendees are already knowledgeable about ACL2, its syntax, its basic commands, and the art of writing models in it. So authors may assume that readers have this familiarity. The workshop proceedings will be published as a volume of Electronic Proceedings in Theoretical Computer Science (EPTCS). Long papers will be published as PDFs, and extended abstracts will be published as HTML snippets. Please see the EPTCS copyright page ( for a discussion of licensing. Please also see the EPTCS LaTeX style file and formatting instructions (

Many papers presented at the workshop will describe interactions with the theorem prover. Authors of such papers are required to provide ACL2 script files (typically, ACL2 books) along with instructions for their use with ACL2, unless they provide a small text file explaining why supporting materials are not appropriate (e.g., for a theory paper). Such supporting materials should have proper licenses and copyrights (feel free to email the workshop chairs if you have questions about that). The books should be certifiable either with custom instructions that are clearly provided, or by running the following shell command in the directory of your contributed books, where $ACL2_DIR denotes your ACL2 sources directory and ACL2 denotes a recent ACL2 executable:
prompt% $ACL2_DIR/books/build/ --acl2 ACL2 *.lisp

Send the supporting materials to Ruben Gamboa, The authors can expect the reviewers to take the supporting materials into account during the refereeing process.

Authors of accepted papers are required to make these ACL2 books available by adding them to the ACL2 Community Books. (The chairs may assist in that process, if asked.)

The workshop will also feature "rump sessions," in which participants can describe ongoing or proposed research related to ACL2. Proposals for rump session presentations, including a title and short abstract, may be accepted until the workshop, but preference will be given to early submissions and subject to available time.