Conducting caucuses is a particular challenge in Nevada, where there are more than 2,000 caucus sites across the state, including in some rural areas. Adding to the challenge this year is an ambitious early-voting plan designed to increase flexibility and participation. Nevada Democrats expect about 90,000 people to caucus; they expect more than half of this year’s caucus-goers to vote early.

During early voting, Democrats are allowed to vote at any site in the state between Feb. 15 and 18, no matter their registered precinct. Under the original plan, upon arrival, voters would have ranked their top three presidential choices on an iPad-based app.

The plan was for that data to be transmitted to voters’ home precincts for the Feb. 22 in-person caucuses. The local caucus leaders, using a second reporting app, were to have incorporated the early voters’ choices into the first alignment and reallocate them if their first choices were not viable. The second app, used by the caucus leader, would have then transmitted the final results to the state party.

Both apps were designed by Shadow, the political technology firm responsible for the vote-recording app implicated in reporting problems in Iowa. On Thursday night, Nevada Democrats announced that they would no longer use any apps.