The investigation into whistleblower allegations of impropriety at the banking inquiry will examine whether the Oireachtas committee was provided with false information.
The terms of reference published this evening also cover allegations of favourable treatment, redactions and conflicts of interest.
Last night, Senan Allen SC was appointed to conduct the investigation and is to report back by the end August.
An investigator from the inquiry made the allegations under the Protected Disclosures Act.
Meanwhile, a committe has said he is not satisfied with the investigation outlined by the Houses of the Oireachtas Service.
Fianna Fáil Senator Marc MacSharry has said that while he does not wish to impugn the reputation of Mr Allen and has no issue with him, the appointment and the investigation should be carried out completely independently of the Houses of the Oireachtas.
Acting Clerk of the Dáil Peter Finnegan briefed the committee on the investigation last night.
The inquiry is meeting privately again this evening to discuss with its legal advisers how to proceed.
There was some heated discussion at last night's meeting with some members unhappy with the public stance taken by Mr MacSharry.
Last night's statement from the Houses of the Oireachtas said the terms of reference will be finalised over the coming days and the investigator will not be constrained in terms of the issues he will be examining.
He will report before the end of next month on the allegations which were made under the Protected Disclosures Act 2014 and which concerned the conduct of the investigation element of the banking inquiry.