The Brumbies have gone to the extraordinary length of commissioning profiles on individual referees as they plot a path to their first Super Rugby title in 10 years.

On the eve of the biggest derby in Australian rugby in more than a decade, coach Stephen Larkham admitted the Brumbies also had leading referee Steve Walsh visit the club at the start of the season to offer advice.

In a revelation sure to fire up the NSW Waratahs ahead of Saturday's knockout semi-final with their arch rivals, it's been revealed the Brumbies have been utilising the expertise of a specialist member of staff to produce dossiers on match officials.

Brumbies referee development officer Mark Snow has been charged with producing profiles of the men who adjudicate the side's Super Rugby clashes.

It's unclear whether Snow, a former referee himself, has prepared a file on South African Jaco Peyper, who will take charge of Saturday's blockbuster showdown in Sydney.

Larkham, when contacted by AAP on Wednesday, confirmed Snow was engaged in providing "an insight into the referees" and that it was "preparation for a standard week".

"We certainly don't try and cheat or anything like that," Larkham said.

"But we know the importance of good, clear communication between the referee and the captain. We know how important that is."

Larkham said it was about "understanding how they interpret the game - that's the key for it really".

But he said the team does not necessarily moderate its behaviour based on the information gleaned from Snow's reports.

"Not as a team, I wouldn't say. The team goes through phases throughout the season where we are talking to the referee too much ... but generally, we go out in a game and the only person that's meant to talk to the referee is our captain ... that's our philosophy.

"It's not so much about giving us an edge. It's making sure we don't make any mistakes out there on the field that will let decisions come into it."

Larkham confirmed, too, that referee Walsh had visited Brumbies HQ earlier this year.

When it was put to Larkham that Walsh, a leading candidate to control Saturday week's final, was one referee who the Brumbies had issues with in the past, he said that was no longer the case.

"He came down to training and gave us a few pointers as to what the referees had discussed and what they're looking for in this Super Rugby campaign," Larkham said.

"I think he's done a fantastic job in terms of re-inventing himself as a referee. Yeah, we're very happy with the way he does his job at the moment."