Reply #6: A real L&A test can also be used to test BDFs.

[Bill Bored]

But you have to cast a random number of votes for each candidate or issue and that could involve quite a few ballots.

This is where ballot styles come in too. You want to test at least one of each identically configured machine with the above test, and that means one of each ballot style -- at LEAST!

None of these tests protect against the possibility that the machines will either fail or be attacked using their real-time clock to trigger a time based exploit. That's why parallel monitoring can help and so can the manual audits -- if you have paper to audit!