The state had notified the Omaha-based company last November that unease about the accuracy of the voting machines may force a decertification of the units.

In a letter sent to the manufacturer, Assistant Secretary of State for Elections Bradley Clark cited a problem encountered during a Nov. 8 test of the system, when a vote was apparently displayed inaccurately.

The state's certification proc-ess requires testing of voting system vendors.

ES&S has been working with the state to address issues that were raised by the test, said a spokeswoman for Secretary of State Bruce McPherson.

"At this point, they've been very responsive to our needs," the spokeswoman said.