ES&S Model 100

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The ES&S Model 100 Optical Scan System from Election Systems & Software is an optical scan voting system.

Main article: Voting machines

Design and operation

Voter verification

The ES&S Model 100 Optical Scan's federally-Qualified Voter-Verified Paper Audit Trail Capability: Uses paper ballots

Brief description

The ES&S Model 100 is a precinct-based, voter-activated paper ballot counter and vote tabulator. The ES&S 100 uses visible light scanning to count and record voter information from paper ballots. The ES&S possesses the capability to recognize and alert voters to over and undervoting errors, allowing them to make changes to their ballots. When the polls close, the ES&S Model 100 prints out the voter logs so election officials can have a paper tally.[1]

Detailed Voting Process

The ES&S Model 100 functions much like a traditional paper ballot system. Upon entering the voting precinct, the voter will receive a paper ballot; the voter then shades in the paper ballot with any standard pen or pencil and inserts the ballot into the ES&S Model 100, where they are given a chance to review their votes. As votes are entered, the ES&S Model 100 stores the vote tallies on its internal memory card. When the polls close, the ES&S Model 100’s internal printer prints out the precinct’s vote report on paper.[2]

Reported problems

Pre-2008 election

The ES&S Model 100 has many reported problems, ranging from unidentifiable malfunctions in a Hawaii election, to missing votes in 98% of precincts in a Texas election, to substantial delays in accepting ballots and returning election results in Rhode Island, to flawed ballot data causing serious election irregularities in another Texas election. These problems have been encountered across multiple versions of the machine and its operating system and after multiple certification processes.[3]

NASED Qualification Status

The National Association of State Election Directors NASED Qualified: Yes[4]

Articles and resources

Related SourceWatch articles


Note: This article was originally copied from the Electronic Frontier Foundation's fact sheet, "Electronic Voting Machine Information Sheet: ES&S Model 100 Optical Scan System,", Version 1.1 of October 29, 2006. See more EFF articles on voting machines at

  1. From the manufacturer’s website, available at:
  2. From the manufacturer’s product brochure, available at:
  3. From the VotersUnite webpage, available at:

External resources

External articles