In Brazil, voting is done with electronic voting machines that resemble telephone panels. Voters key in the number of their preferred candidate, and the machine logs the result.
While this voting method looks simple on the surface, it presumes voters are properly informed on which number corresponds to which candidate before they enter the voting booth.
The implementation here is critical, because if voters get the numbers wrong, they can accidentally vote for the wrong candidate. In contrast, this would not be a problem in countries where voters are given ballot papers where all the candidates are already on the ballot.
How does Brazil ensure that their voters are properly informed on their candidate's assigned number prior to the election?
PS: The same question can apply to countries like Finland, where voters are expected to transcribe a number onto the ballot paper which corresponds to their preferred candidate.