Elections in Scotland are set for a major overhaul after publication of an independent report into May's Holyrood and local government election chaos.
Ballot papers were scanned by vote-counting machines
The results process was besieged by delays and saw some 140,000 ballot papers rejected.
It is thought the report will blame confusion over who was in charge.
It is also expected to indicate that the "logical choice" could be to shift power over Scottish Parliament elections from Westminster to Holyrood.
Election expert Ron Gould has spearheaded the inquiry, which was sanctioned by the Electoral Commission.
Mr Gould is due to deliver his findings at a news conference in Edinburgh at 1100 BST.
The elections saw the introduction of a new design of ballot paper for the parliament vote and a new voting system for the council seats.
In the aftermath of the vote, many blamed the redesign for causing the fiasco.
Mr Gould, who is the former assistant chief electoral officer of Canada, was allowed, along with his team, to scrutinise the rejected ballot papers.
While Westminster is in charge of overseeing the Holyrood elections, the Scottish Parliament has control of the council votes.
It is thought the Gould report will say there should be a single team in charge.
BBC Scotland political editor Brian Taylor said: "It will suggest politicians get their heads together while floating the prospect of devolving power to Holyrood.
"The report will also accuse politicians of paying too much attention to their own party interests instead of the needs of the voters."
First Minister Alex Salmond has previously said he wanted a judicial review to be carried out into the election after the findings of the current investigation were published.