A Crime and Misconduct Commission (CMC) representative says a Queensland parliamentary inquiry into the release of Fitzgerald inquiry documents has been heavy-handed.

Judith Bell is one of the CMC's four part-time commissioners, who head the organisation along with the chairperson.

She has told the parliamentary oversight committee, while the CMC was remiss in allowing the documents to be released, the questioning of some CMC staff has been heavy-handed.

"I felt that it was an anvil to crack a nut," Mrs Bell said.

She has told the inquiry that while there are areas for improvement, the organisation's activities are well documented.

"My experience of the CMC is that everything is documented very well and everything is reported to this committee very assiduously, so I think at the time this was not seen as a major issue."

But committee chairwoman Liz Cunningham disagreed with that assessment.

"Mrs Bell, to be frank with you I find the documentation at the CMC appalling on the basis of the two weeks of hearings that we've had, so I'll have to disagree with you on that point.

"It is our responsibility to ensure that the operation of the CMC is not only in accordance with the Act, but in accordance with the spirit of the legislation," Ms Cunningham said.

Another commissioner, George Fox, told the committee it is appropriate to find out why this happened and to stop it from happening again.

Acting CMC chairman Warren Strange says the organisation should be judged on its good results, not just the mistakes that have been made.

He told the committee the errors should be kept in perspective.

"What's happened here is as I've said a cause of great dismay to us, but I would ask that the committee keeps in perspective the considerably impressive results that the commission has achieved in recent years," he said.