"There have been some mistakes that our race officials have made, we don't want to see mistakes, but say we are dealing with people, so mistakes will occur from time to time.
"But one mistake is too much.
"It's all about people. The technology in it is & # 39; the world's best practice.
"This is about when you give people the lead in making decisions, make really difficult decisions, and sometimes they will make mistakes."
Greenberg added that commentators or fans abused abusers and judged officials.
"We are keeping a close eye on other sports around the world and especially those that will happen in our own country and mistakes and they create huge controversies," Greenberg said.
"It's just an unfortunate part of the sport, we have to hold them to account and help them get better.
"Tying them up week in week out, their performance is unlikely to improve."
The AFL has also had several problems with its score rating system and after looking at the bunker of the NRL in recent years, it will set up a centralized system that can be tested this year and rolled out in the future.
It is clear that AFL officials visited the bunker in previous years, but Greenberg said he did not think this had happened this year, although officials from both codes talked regularly.
"I know we have had some cooperation with the AFL, FFA and cricket because they have all looked at what we have built and we are happy to share those experiences because we are only as good as what the best initiative is," Greenberg said.
"If they look at those things, I would appreciate it if, ultimately, what fans want is that they want decisions to be made accurately.
"When we put the bunker in, it was based on four measures: accuracy, efficiency, doing it as quickly as possible and transparency.
"When you view our games or go to a game, you will hear the reasons why the decision is made.
"All those things are really important to make sure we get the right outcome, but it doesn't always happen that way."
Regarding the concussion problem, Greenberg said that the NRL constantly updated its working methods as new investigations were revealed and the game was also investigating financing investigations, although it was too early to discuss.
Recent research on gridiron players in the NFL provided alarming news in recent weeks, but Greenberg said the Rugby League was a different game and treated concussion better than the NFL in previous decades.
"I think that much has been lost in public comments," Greenberg said.
"They are not at all like-for-like. The moment we find new information, we develop and review our policies and procedures.
"That is very different from what we have seen abroad."
Roy Ward is a writer of sports articles for The Age.