Whistleblowers are lining up to detail the mismanagement and mistakes that led to Queensland's health payroll disaster.
And one of them claims there was so much pressure to get the system up and running, that staffers were told to stop looking for defects.
Taxpayers are facing an estimated $1.2 billion bill associated with the problem-plagued payroll system, rolled out under the former Bligh Labor government.
Premier Campbell Newman has announced a $5 million inquiry, saying taxpayers deserve to know why they've been left with such an enormous bill.
The 2010 rollout of the flawed system left thousands of health workers underpaid, overpaid or not paid at all.
Mr Newman has promised protection for whistleblowers who want to tell the inquiry what they know.
On Thursday, The Courier-Mail said it had been contacted by several staff who wanted to give evidence to the inquiry.
One former Queensland Health staffer, who was employed in Queensland Health's program management office when the payroll went live, told the paper it was so riddled with serious defects that the project team was told to stop testing for errors in the lead-up to the launch.
"They didn't want to find any more errors," said the former employee, who asked not to be named until the inquiry.
"The number of defects discovered during the testing process were astronomical. I have never seen anything like it."
The former employee also said there was intense pressure on those working on the rollout to launch it, despite the weight of evidence that the system did not work properly.
The inquiry will investigate issues including how IT company IBM came to be hired for the task, and its implementation of the system, and the quality of information provided by the Queensland government.
Another whistleblower last month claimed there was collusion, involving the government's internal IT provider CorpTech, to ensure IBM won the contract for the payroll system.
The inquiry, to be led by former Court of Appeal Judge Richard Chesterman QC, will begin in February, with Mr Chesterman due to hand down his report by April 30.