Tuesday, December 23, 2025
An engineering change order (ECO) is a change to a previously EAC-certified voting system’s hardware, documentation, or data that is minor in nature and effect. ECOs require voting system test laboratory review and endorsement as well as EAC approval. Any proposed change that is not deemed to be a minimal change is a modification and must be submitted for testing and review consistent with the EAC Testing and Certification Program requirements.
Engineering Change Orders
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Manufacturer
- Show all (267)
- Dominion Voting Systems Corp (This company was purchased by Liberty Vote USA Inc. ) (85)
- Hart InterCivic, Inc. (43)
- Unisyn Voting Solutions (a division of International Lottery and Totalizator, Inc) (32)
- Clear Ballot Group, Inc. (25)
- MicroVote General Corp. (14)
- Liberty Vote USA Inc. (1)
- (-) Election Systems & Software, Inc (ES&S) (67)
| ECO | Manufacturer | Testing Lab | Impacted Device/System | Date Approved |
|---|---|---|---|---|
| ESS-683 | Election Systems & Software, Inc (ES&S) | NTS Huntsville (formally Wyle Laboratories) | DS200 Scanner |
05-10-2011 |
| ESS-819 | Election Systems & Software, Inc (ES&S) | DS200 Scanner, Emergency Bin |
05-10-2011 | |
| ESS-982 | Election Systems & Software, Inc (ES&S) | SLI Global Solutions (formerly SysTest Labs) | ExpressVote XL |
02-19-2019 |
| ESS-983 | Election Systems & Software, Inc (ES&S) | Pro V&V | DS200, Hardware 1.3.10.0 |
12-14-2018 |
| ESS-996 | Election Systems & Software, Inc (ES&S) | Pro V&V | EVS (DS450 component) |
12-12-2018 |
| ESS ECO-1160 | Election Systems & Software, Inc (ES&S) | Pro V&V | Delkin 3.0 USB Flash Drive (4GB, 8GB) models 6206 and 6207; EVS 5.2.0.3. |
12-07-2023 |
| ESS ECO-1167 | Election Systems & Software, Inc (ES&S) | Pro V&V | EVS 6.3.0.0. |
04-09-2024 |