The ICC said a team's referrals will be topped-up to two reviews after 80 overs in Test matches where the Decision Review System (DRS) is used. Currently, a team is allowed up to two unsuccessful reviews per innings.
The decision to introduce the new trial was taken at the two-day ICC Chief Executives' Meeting which also decided to form a Working Group to review the objectivity of the DRS system.
"A trial will be conducted whereby a team's referrals will be topped-up to two reviews after 80 overs of an innings. This trial will start from 1 October 2013 in all Test matches in which the DRS is used, with the results being monitored and considered by the Working Group," the ICC said in a release.
"The CEC agreed that a Working Group be constituted to consider how the ICC should best use technology in umpire decision-making in the future," the release said.
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"The considerations of the group will be wide ranging and include a review of the objectives and philosophies of using the technologies, protocols and procedures as well as the role and training of television umpires."
The CEC reviewed the performance of the Decision Review System (DRS) during the Ashes series and received an update on a technology trial that was conducted during the Old Trafford Test.