The first Test match between Bangladesh and New Zealand in Chittagong is the first match in which new playing conditions are being used.
The amendments to the playing conditions - but not the laws of the game, govern the Decision Review System (DRS), changing the match ball, and the match ball itself in One-Day International cricket.
From today, teams will have their available reviews 'topped up' to two at the 80-over mark giving them a maximum of two reviews up to the 80-over mark and a maximum of two more from 80 overs until the end of the innings.
This is a trial that will end on 30th April 2014.
Umpires now have more power to act if the condition of a ball has been changed but they are unable to identify the person who has done so.
If the condition of the ball has been changed but the player is not identified, the ball will be changed, the captain issued a first and final warning (which will last for the remainder of a Test match or ODI/T20I series).
If the ball's condition should change again, a 5-run penalty will be awarded, the ball will be changed and the captain held responsible and reported.
Where the player changing the condition of the ball is identified, the ball will be changed, a five-run penalty applied and the player reported.
Meanwhile, in One-Day International matches where the overs are reduced to 25 overs or less, each time will only be able to use one new ball per innings.
© Cricket World 2013