ICC's decision review system is set for another high-profile examination in the Test series between South Africa and England.

It will do so with cricket's world governing body citing reassuring statistics of majority support from players and officials alike.

The ICC concede there is not blanket approval - and it is just as well they do, because remarks from opposing captains Andrew Strauss and Graeme Smith make it clear there are still significant reservations.

Both Smith and Strauss have experienced the teething problems of a system designed to minimise the number of incorrect umpiring decisions - by using video, computer graphic and stump microphone technology to assist a third-official review.

Complications have already arisen in previous series - notably for England in the Caribbean last winter - often emanating from a structure which requires the players themselves, rather than umpires, to initiate a review. It is Smith who has the most qualms.

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"At the start of the series, I have my doubts," the South Africa captain admitted on the eve of the first Test at Centurion.

"It needs to prove its worth to me."

An initial provision for a maximum three unsuccessful reviews by either team in any innings has been reduced to two.

"We had a few frustrations with it in the last series against Australia," Smith recalled.

"We felt that it probably caused a few more frustrations than added value."

The ICC believe the DRS will benefit their sport in the long term, however, as long as it is given a fair opportunity to establish itself.

Smith added: "We're told it does improve the standards of the game, so we're going to go along with it and be positive about it - and try to use it to the best of our ability.

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"But I'm a little bit sceptical. We'll see how it goes through the series."

The DRS inevitably brings with it a new raft of tactics in a sport already full of them.

The ICC have advised players to challenge only decisions they believe are clearly wrong. But human nature dictates the temptation to ask for a review is likely to be greater if a key batsman is involved.

The batsman must call himself for a review, while in the field the onus falls on the captain.

"The ICC are going a long way towards making our jobs a lot more difficult these days," Smith smiled.

"I will take the advice of players - if you can trust your bowlers."

Strauss, meanwhile, already appears to have given the process plenty of thought.

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"You have to be smart about how you use it - and having experience probably helps you in that respect," he said.

"I'm trying to cast my mind back to how things worked in West Indies and what lessons we learned.

"There are some reservations about it - and after some of the games recently, the initial reservations I had haven't gone away.

"But it's there, we have to go out and trial it - and maybe the more we use it the better it will get.

"You can't rule something out completely until you have tried it."