Tendulkar wants ICC to relook DRS

Subject : Technology

Context : A series of dodgy decisions in the ongoing Boxing Day Test in Melbourne has left umpires under the scanner.

Concept :

Decision Review System

DRS is technology-based system used in sport of cricket for the sole purpose of reviewing controversial decisions made by on-field umpires as to whether or not a batsman had been dismissed.
The system was first tested in an India v Sri Lanka match in 2008. It was officially launched by the International Cricket Council (ICC) in 2009 during the first Test match between New Zealand and Pakistan.
Initially, ICC had made the DRS mandatory in all international matches, but later made its use optional, so that the system would only be used if both teams agree.

How does DRS works?

The DRS comprises a combination of several off-field technologies. Using these off-field technologies, the third umpire informs the on-field umpire whether to overturn or uphold their original decision.
Off-field technologies of DRS includes
footage from TV cameras placed around the ground;
Hot Spot, an infrared camera system that highlights parts of the bat and body that have been hit by the ball;
Hawkeye, a ball-tracking system usually used to check leg before wicket decisions; and
Real time Snickometre, a waveform of the sound captured by a stump microphone.