The Chief Ombudsman says a major review of the Official Information Act will scrutinise all 27 government ministers' offices.
Dame Beverley Wakem today began her review of the way the public sector used the OIA, which she first announced in August.
Twelve government agencies have been selected for formal review, based on their size, number of OIA requests, complaints, and other criteria.
A further 63 agencies and all ministers' offices have been asked to complete a detailed survey. At least one agency cited for good OIA practice would be included in the review.
The Ombudsman's office would also seek input from past and present public servants, Opposition parties, journalists, academics and others.