CRICKET REVIEWS

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The Umpire Decision Review System (UDRS or DRS) is a technology-based system used in cricket to assist the match officials with their decision-making. On-field umpires may choose to consult with the third umpire (known as an Umpire Review), and players may request that the third umpire consider a decision of the on-field umpires (known as a Player Review).
The main elements that have been used are television replays, technology that tracks the path of the ball and predicts what it would have done, microphones to detect small sounds made as the ball hits bat or pad, and infra-red imaging to detect temperature changes as the ball hits bat or pad.
While on-field Test match umpires have been able to refer some decisions to a third umpire since November 1992, the formal DRS system to add Player Reviews was first used in a Test match in 2008, first used in an ODI in January 2011, and first used in a Twenty20 International in October 2017.
DRS was preceded by a system to allow on-field umpires to refer some decisions to the Third umpire to be decided using TV replays, in place since November 1992.
The addition of Player Reviews and additional technology to this system was first introduced in Test cricket, for the sole purpose of reviewing controversial decisions made by the on-field umpires as to whether or not a batsman/batswoman had been dismissed. The system is based on the concept of player - referral conceived by Senaka Weeraratna (Sri Lankan lawyer). He was the first to suggest a Player Referral System for Cricket in a letter published in the ‘Australian’ national newspaper on March 25, 1997. Until he drew public attention to the benefit of such a player referral system there was no such system or mechanism even in other Sports, prior to March 25, 1997. The Player Referral system was first tested in an India v Sri Lanka match in 2008,[1] and was officially launched by the ICC on 24 November 2009 during the first Test match between New Zealand and Pakistan at the University Oval in Dunedin.[2][3] It was first used in One Day Internationals (ODI) in January 2011, during England's tour of Australia.[4] The ICC initially made the UDRS mandatory in all international matches,[5] but later made its use optional, so that the system would only be used if both teams agree. The ICC has agreed to continue to work on the technology and will try to incorporate its use into all ICC events.[6]

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