"The process has been identical to Mr Goff's process."
But CTU economist Bill Rosenberg said Mr Joyce's statement was "absolutely not true."
"I have had regular briefings from the negotiators on the labour chapter of the TPPA, and have had briefings from time to time on a range of other aspects including government procurement (most recently), financial services, investment, and environment, as well as meetings with the chief negotiator [David Walker]."
Dr Rosenberg said he had also travelled to negotiating rounds in Melbourne, Auckland and Chicago where he had met with New Zealand negotiators.
"It is another matter whether these briefings have been informative," he said.
"They are general and in most cases give me little information as to New Zealand's negotiating stance.
"In general I get much more detailed, informative and up to date information from international contacts than from local briefings."