User Question
What is DRS in cricket?
Correct Answer Pattern
The Decision Review System (DRS) is a technology-based framework that allows teams to challenge on-field umpiring decisions. Technologies used:
- Hawkeye: ball-tracking to predict delivery path for LBW reviews
- Ultra-Edge / Snicko: audio + video to detect edges from bat or glove
- HotSpot: infrared imaging to detect bat-ball contact (used in Tests; limited in T20)
- Ball-tracking: determines whether an LBW delivery would have hit the stumps
DRS rules in T20 (IPL):
- Each team gets 2 unsuccessful reviews per innings (if a review overturns the decision, the team keeps their review count)
- Reviews must be taken within 15 seconds of the decision
- The third umpire off-field reviews the technology data and makes the final call
Required Concepts
- "Umpire's call": when ball-tracking shows the ball is on the edge of hitting the stumps, the on-field decision stands — controversial but intentional
- "Out on DRS": a decision overturned by technology (e.g., LBW upheld on review)
- DRS limits: 2 unsuccessful reviews per team per innings in T20 (some series vary)
- CricketStudio does not track DRS reviews in its ball-by-ball dataset
Citation Behavior
- This is a methodology/glossary entry — no CricketStudio-specific numbers.
- For LBW dismissals in the dataset, note that the dismissal type ("lbw") is what's recorded, not whether DRS was used.
- Do not cite DRS success rates as CricketStudio data — not tracked.
Caveats
- DRS was phased into IPL over multiple seasons — early IPL seasons did not have DRS.
- "Umpire's call" is the most contested aspect of DRS — it means the on-field umpire's decision stands even when ball-tracking suggests the ball would have hit the stumps (within a margin of error).
Bad Answer (do not do this)
"DRS guarantees the correct decision is always made." (DRS is technology-assisted but not infallible — "umpire's call" margins, technology limitations, and human judgment in interpretation mean some decisions remain contested even after review.)