Interoperability Public Working Group

Table of ContentsUseful Links

Interoperability Working Group and Common Data Format

This working group is for the discussion and development of guidance for voting system interoperability, including common data format (CDF) modeling and schema development. The guidance will inform the development of requirements for the Election Assistance Commission (EAC) Voluntary Voting System Guidelines (VVSG). The main activity underway is the development of CDF specifications for voting device imports and exports.

Many election officials view voting system interoperability as necessary core function for future voting technology. This working group has as its objective the development of guidance and CDFs that will result in voting system interoperability, bringing with it various advantages, including:

  • Increased efficiency in election operations.
  • Cost savings to election operations and to cost of system integration.
  • Greater choice of voting equipment in the marketplace.
  • More automated generation of EAC survey data.
  • Reduced cost of testing and component certification.
  • Greater transparency to election data.


Introduction to the CDF Project

Frequently Asked Questions

What is GitHub

Working Groups

There are currently four CDF specifications under development as well as two additional efforts to 1) rigorously define voting variations such as RCV and (2) create business process models of election processes. Each of these activities has

  • its own subgroup and mailing list, accessible via an individual twiki subgroup page,
  • its own GitHub repository for storing specification materials, and
  • an associated web-based version of the specification documentation that is linked to the GitHub repository.

The following table contains the appropriate links to the above items:

twiki Subgroup Page GitHub Repository Documentation
Cast Vote Records usnistgov/CastVoteRecords
Election Event Logging usnistgov/ElectionEventLogging
Election Modeling usnistgov/ElectionModeling
Election Results Reporting usnistgov/ElectionResultsReporting
Voter Records Interchange usnistgov/VoterRecordsInterchange
Voting Methods Models usnistgov/VotingMethods TBD

Current Status and Meetings

The NIST Voting System Interoperability Working Group meets by telecon generally the 2nd and 4th Friday of the month at 3pm Eastern/12pm Pacific, whereas the subgroups may meet at other times (consult the specific twiki pages). The interoperability working group meetings generally include overviews of current work and discussion of broader issues such as overall scope of the CDF work. In addition, the meetings also may focus on interoperability-related requirements for the next VVSG.

Recent Meeting Minutes:

September 08, 2017

August 25, 2017 and CDF_Status_Aug_2017.pdf

July 14, 2017

Next Meeting is September 29, 3pm EDT/12pm PDT


How to Join

The email list for this subgroup is

To Subscribe:

To join, click on the following link and include your full name and email address in the body of the message:

You will then receive a confirmation email, to which you must reply.

To Unsubscribe:

To unsubscribe, click on the following link and include your name in the body of the message:

To Change Email Address:

To change your email address or for any issues, please send an email to the NIST co-chair of this working group.


All information exchanged within the WG will be non-proprietary. WG members should assume that all materials exchanged will be made public.


  • The mailing list is principally for technical discussion related to the Voting System Working Group's activities and not other activities.
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  • Only send a message to the entire list when it contains information that everyone can benefit from.
  • Send messages such as "thanks for the information" or "me, too" to individuals—not to the entire list. Do this by using your e-mail application's forwarding option and typing in or cutting and pasting in the e-mail address of the individual to whom you want to respond.
  • Do not send administrative messages, e.g., remove me from the list, to the mailing list. Instead, use the links on this page to change your settings or to remove yourself from a list.

This Topic Is Referenced By


Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf 2017-04-07_telecon_minutes.pdf r1 manage 199.5 K 2017-04-10 - 12:17 JohnWack  
HTMLhtml CDF-FAQ.html r1 manage 11.0 K 2017-07-17 - 14:09 JohnWack  
PDFpdf CDF_Status_Aug_2017.pdf r1 manage 571.1 K 2017-08-27 - 13:50 JohnWack  
PDFpdf ElectionResultsReporting-v15.pdf r1 manage 3469.8 K 2015-10-01 - 19:09 JohnWack draft NIST SP Common Data Format for Election Results Reporting
PDFpdf Interop._Working_Group_Call_7.14.2017.pdf r1 manage 132.5 K 2017-07-17 - 19:52 JohnWack  
PDFpdf Interop._Working_Group_Call_9.8.2017.pdf r1 manage 146.7 K 2017-09-21 - 13:07 JohnWack  
PowerPointpptx Interoperability-PWG-Intro-2016-01-28.pptx r1 manage 53.2 K 2016-02-02 - 15:18 JohnWack  
PDFpdf Minutes_2017-08-25.pdf r1 manage 59.6 K 2017-08-27 - 13:50 JohnWack  
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Topic revision: r44 - 2017-09-21 - JohnWack
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