The court will consider what is expected of D and whether he failed to do it, or did it to a poor standard.
The standard expected is that of the reasonable man in the same circumstances:
Blyth v Birmingham waterworks.
(the reasonable man)
No allowances are made for inexperience. In Nettleship v Weston, a learner driver was judged by the standard of the reasonable driver.
(the reasonable man)
However, where children are concerned, some allowance is made:
In mulin v richards, a 15 year old girl injured a schoolmate whilst fencing with plastic rulers was judged against the standard of a reasonable child of a similar age under similar circumstances.
(the reasonable man)
Professionals will be judged against the standard of a reasonable competent professional in that field.
In Bolam v Friern, the standard required of a doctor was that he had followed a course of action that was supported by a reasonable body of medical opinion.
In Bolitho v City and Hackney Health Authority the Bolam test was modified to clarify the practice of such reasonable body of medical opinion must be responsible and capable or logical analysis.
Wilsher v Essex AHA junior doctors will be judged the same as qualified doctors.
(4 factors when deciding the standard of care expected in the circumstances)
Likelihood of harm or injure: The more likely the harm, the greater the care that is expected of D. (bolton v Stone, D was not in breach of duty) (Hilder v Associated Portland Cemen, D was in breach of duty)
(4 factors when deciding the standard of care expected in the circumstances)
2. Seriousness of consequence: a higher standard of care is expected from D where a serious injury is foreseeable (paris v stepney BC, D had no breach of duty)
(4 factors when deciding the standard of care expected in the circumstances)
3. Cost of reasonable precautions: the lower the cost of reasonable precautions, the higher the standard of care expected. D is not expected to take unreasonable precautions. (Latimer v AEC, there was no breach in duty)
(4 factors when deciding the standard of care expected in the circumstances)
4. Social utility: if what D is doing is valuable to society then he may not be held in breach of duty. (watt v herts CC, D was not in breach of duty)