Test cricket teams will be given two extra decision reviews after 80 overs of an innings in a trial period starting on Octover the 1st.
The decision was made by the International Cricket Council (ICC) at a chief executives' committee meeting in Dubai.
At present teams are allowed only two reviews an innings.
The Decision Review System was criticised during the last Ashes series when the umpire missed a thick edge off the bat of England's Stuart Broad which was caught behind, but Australia was unable to appeal having used up its quota of reviews.
The ICC says the 'Snickometer' system, used to resolve contentious decisions concerning contact with the edges of the bat, could ultimately be included in the list of approved DRS technologies subject to an independent assessment.
It says further investment should be provided for the training of television umpires.
