State-of-the-art technology will be used at the World Cup in order to speed up the time taken to make an incorrect decision.
In addition to a sensor in the middle of the ball, which sends data 500 times a second to determine the exact kick-point, 12 cameras will be mounted on the roof of each stadium to track the ball and 29 points on each player.
The video assistant referee booth can be used to alert the on- pitch referee if a player is in an offsides position.
At last year's Arab Cup and Club World Cup, it was thought that the system would reduce the time taken to make VAR decisions from 70 to 25 seconds.
We are happy. The head of refereeing said it was ready.
Increased use of technology is said to be rendering referees impotent in making decisions.
Collina, who was voted the world's best referee for six consecutive seasons from 1998 to 2003 and took charge of the 2002 World Cup final between Brazil and Germany, denies this is the case.
He said he read about robot refs. It is good for headlines, but it is not.
The match officials are still involved in the decision making. When a player plays the ball, the technology only gives an answer if the player is in an upright position. The referee can assess interference with an opponent and see if a foul was committed.
The goal is to get referees to make correct decisions. There will still be room for discussion even if the referee uses technology to get a better view of what happened.
Anthony Taylor and Michael Oliver have been selected to be part of an elite panel of referees who will meet in the Middle East two weeks before the World Cup.
There has been debate about the time taken to determine whether a ball has crossed the line or not, but Collina does not think the new technology is any different to the systems used to determine whether a ball has crossed the line or not.
That didn't work in the first game of the Project Restart, when Orjan Nyland carried the ball into his own goal and Hawk-eye didn't see it. Collina doesn't think that is a problem.
He stated that technology works most of the time. In thousands of correct decisions, that is one wrong one.
Goalline technology is very accurate. Everyone is happy if the ball crosses the line by a small amount. Semi-automated technology is the same. The technology should be applauded if the player is on or off the field.
We don't have time to make a decision. It would be wrong to expect that. We have fallen from 70 seconds to 20 or 25. It's important. The system will be more precise.
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