would be walking on the street and the risk of him injuring himself justified the precautions of putting up a barrier. The test is a balance of reasonableness of precautions against the likelihood of injury being sustained. What is the social importance of the defendant's activity? If the defendant's actions serve a socially useful purpose then they may have been justified in taking greater risks. Thus, in Watt v Hertfordshire CC (1954) 2 AER 368, the fire brigade was not negligent in getting the wrong vehicle to the scene of an accident because valuable time would have been lost in getting the best vehicle there to help. Since 26 July 2006, this consideration has had a statutory basis under section 1 of the Compensation Act 2006. Common practice. A defendant complying with a common practice in his area of activity will usually be considered to have met the standard of a reasonable man, unless the court judges the practice itself to be negligent. In Paris v Stepney Borough Council (1951) 1 AER 42 although there was a practice of not providing employees with safety goggles, the Council owed a special duty to protect the claimant because he had already lost the sight of one eye. Sporting events The conduct expected from a participant in a sports event towards his competitors or spectators differs from the conduct of a reasonable person outside such events. It has been held that in the "heat and flurry" of a competition, a participant will only be in breach of duty towards other participants and spectators if he shows "reckless disregard for their safety". At the same time, in another case, the standard of care expected from one player towards another is the usual standard of taking "all reasonable care in the circumstances in which they were placed", although in that case the defendant was also found to be acting recklessly. It is not clear at present if and how the two approaches can be reconciled. Burden of proof THE OBLIGATION TO PROVE ONE'S ASSERTION is burden of proof. Whether or not the defendant in a given case has conducted himself below the standard of "a reasonable person" is a question of fact and it is for the claimant to prove this fact. However, in certain situations it is unlikely that a certain event could take place without the defendant's negligence, for example if a surgeon