Once the ballots are counted, a verification of the count is recommended.
This verification is usually the last one before the interim results are transmitted to the local office of the electoral management body. This final verification is important to make sure that no ballots have been introduced or removed that would modify the results in favour of or against one candidate/party/option.
This last verification should include a comparison to the reconciliation done previously, before opening the ballot box. The total number of ballots for each candidate, plus the rejected ballots, the unused ballots, and the spoiled ballots should match with the total number of ballots received at the opening of the polling station. Where envelopes are used, they should be recounted as well in order to match with the number of voters who cast their ballots.
If errors are detected, the count sheet should be verified against count sheets of other poll workers. If the error is still not found, then all the ballots counted per candidate/party/option should be re-examined and recounted.