Umpire Tony Hill signals for a referral during England's Caribbean series

The International Cricket Council has approved the use of video referrals to challenge umpire's decisions.

But it will not be in force for the Ashes between England and Australia taking place this summer.

Having been given a trial in four Test series, the review system will come into permanent effect in October.

On day one of a four-day conference the ICC admitted concerns about undermining umpire authority but thought the positives outweighed the negatives.

The possibility of Pakistan staging matches at the 2011 following security concerns will be discussed this week.

Another revolutionary proposal that may also come to light is that of day/night Test matches, which the ICC revealed it would examine further.

Trials are continuing to determine the colour of the ball to be used, with the traditional red one deemed unsuitable for artificial light.

606: DEBATE Your thoughts on the referral system

Cricket's governing body has also instigated tougher measures on boards providing "poor" pitches and has doubled the fines for slow over rates.

The controversial review system lets players request that umpire's decisions are reviewed by a third official using TV pictures.

It was tested in England's series in the West Indies but after widespread criticism from players and commentators, the ICC decided to make changes.

It planned to give umpires more training and fine tune the technology.

The decision to permanently implement the Umpire Decision Review System (UDRS) in a "phased roll-out" from October was made earlier this year by the ICC's cricket committee, chaired by former West Indies captain Clive Lloyd.

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