Evans told AFL.com.au's Footy Feed on Tuesday night he was "delighted" with how the score-review system was working in 2014, but said goal-line cameras could improve it.
Once installed, the goal-line cameras will be used at every game at the two Melbourne venues for the rest of the 2014 season.
Evans said the trial would tell the AFL precisely how much goal-line cameras improved the score-review system, suggesting that this would help determine whether the League installed them at other venues.
"We need a solution that's robust, that doesn't drop out. It's not easy venue to venue," Evans said.
"But I'm happy to tell you that in three or four weeks time the two venues in Melbourne will come online and we can genuinely test to see whether there's benefit in that system.
"Funding is always an issue, but what we have to do is prove to the world that the funding that we're spending is efficient.
"It's complicated and it will end up being a complete refit of cabling and routers at the MCG and Etihad and we'll put in some cameras on the posts for all games for the rest of the year, from about round 12 onwards.
"That will tell us what benefit we get."
Evans said in 11 of almost 40 score reviews conducted this season the AFL felt it had not had enough information to make a decision.
But eight of those 11 reviews would have been assisted by goal-line cameras, Evans said.
"But the question is how far do you go?" he said.
"We will always have some things in our game that won't be captured, but the question for me is when we get to the end of this year we'll be better informed than we are now."
In a wide-ranging interview, Evans also said:
· The AFL had been briefed on Toby Greene's police charges.
· The bump rule remained clear-cut despite Jack Viney's successful Tribunal appeal.
· The AFL is exploring changes to the Etihad Stadium roof policy based on fan feedback.
· The costs of running stand-alone second-tier teams are a contentious part of the equalisation debate.
