| A | B |
| Degree of probability that harm will be done | Bolton v Stone |
| The magnitude of likely harm | Paris v Stepney Borough Council |
| The cost and practicality of preventing the risk | Latimer v AEC Ltd |
| Potential benefits of the risk | Daborn v Bath Tramways |
| Potential benefits of the risk | Watt v Hertfordshire CC |
| Professional Persons | Bolam |
| Nettleship v Weston | He must drive in as good a manner as a driver of skill, experience and care. |
| Haley v LEB | Degree of Probability of harm |
| Bolitho | Professional persons |