Vic education anti-corruption hearing over

Lavish overseas junkets, secret payments, insider share trading and dancing girls - an anti-corruption hearing into the activities of Victorian education department bureaucrats had it all.

Almost four weeks of public hearings pointed to one man, former deputy secretary Darrell Fraser.

Many witnesses blamed him for the failings of the multimillion-dollar Ultranet IT project by breaking procurement rules, while others argued his rule-breaking and "liberal" spending of department money was all for the good of education.

So when Mr Fraser took the stand, as the last witness to be publicly questioned as part of the Independent Broad-based Anti-corruption Commission (IBAC) hearings in Melbourne on Wednesday, it was no surprise that retired principals and teachers from across the state filled the court room.

Despite applying to be questioned in private or not at all, Mr Fraser confirmed many of the allegations made against him and staunchly denied claims he favoured one Ultranet tenderer over another.

Mr Fraser admitted to funnelling almost $1 million to CSG, the company that was eventually awarded the doomed Ultranet IT project.

He told the hearing he was under the impression that without the extra funding the project was unlikely to go ahead - and he made the decision to save it.

Early indications were that the project would cost in excess of $100 million - $40 million more than agreed in the contract, he said.

"I thought it was my only option," Mr Fraser said on Wednesday.

"It was a grave error in my judgment and I was acting unprofessionally."

He later learnt the money was used for other CSG projects and not the Ultranet system.

He also told the hearing he wiped his office computer when he left the department in 2011 and destroyed a number of department documents that he took home with him in 10-12 tubs.

None of them, he says, related to the ill-fated Ultranet project.

Mr Fraser was not the only former department official who has been under the spotlight as part of the IBAC investigation.

Some former senior officials have admitted during the hearings to buying shares, taking jobs with CSG and using their positions to benefit themselves, including attending lavish overseas junkets.

Others had their phones tapped and conversations played during the hearings - including a number of expletive-ridden chats between former acting deputy secretary John Allman and Regional director Matt Dunkley.

Mr Dunkley was suspended on Tuesday following evidence aired during the hearing.

The Ultranet scheme, initiated under the Brumby Labor government, was scrapped by the Napthine coalition government in 2013 when costs blew out from $60 million to more than $180 million.

At the completion of the hearing, IBAC commissioner Stephen O'Bryan said he would prepare a report which would be tabled in parliament later in the year.

His findings for another anti-corruption investigation into the education department's use of "banker schools" will be tabled in parliament within six weeks - that report was delayed because of crossovers between the Ultranet investigation, Mr O'Bryan said.