  This paper explains the main principles and some of the technical details for
auditing the scanning and digitisation of the Australian Senate ballot papers.
We give a short summary of the motivation for auditing paper ballots, explain
the necessary supporting steps for a rigorous and transparent audit, and
suggest some statistical methods that would be appropriate for the Australian
Senate.
  22 June 2022 Update: The update includes analysis of Senate preference data
from the 2022 Australian election.
