The Australia cricket captain Michael Clarke admits he must get better at using the decision review system, in the wake of his side's 14 run loss to England in the first Ashes test.
Clarke says he has no idea how cricket can fix major DRS mistakes but knows Australia's wasting of reviews was ultimately costly against an England team who have perfected the art of challenging.
Brad Haddin's faint nick behind with Australia 15-runs short of a miraculous first Test Ashes win at Trent Bridge proved a correct call by DRS.
But Haddin's dismissal on a slight nick further highlighted how the issue given England's Stuart Broad managed to survive despite a full-blooded edge to slips.
England have a system where a majority of captain Alastair Cook, wicketkeeper Matt Prior and the bowler need to agree on referring a decision.