However if the cases are not the same the judge should reason by analogy, meaning they look at a similar case and decide if a duty should be owed.
An example of reasoning by analogy is Robinson V CC of WY.
If a case is truly novel, 'the three part Caparotest' is applicable.
The first stage of the Caparo Test it must be shown that the losssuffered by the claimant was reasonably foreseeable.
The third stage of the Caparo Test requires the court to consider whether it would be fair, just and reasonable to impose liability on the defendant.
The second stage of the Caparo Test is whether there was a sufficientproximity (physical, time or relationship.) between the claimant and defendant.
KentVGriffiths 2000 is a case example that held the outcome of further injury from the asthma was reasonably foreseeable.
Even if the outcome is reasonably foreseeable, a breach can only be established if there was a sufficient proximate relationship between the defendant and the claimant.
A case example of the Close Proximity Test is Bourhill V Young 1943 which held that there was not a sufficient proximate relationship present between pregnant woman and accident.
Courts are more reluctant to impose a duty of care on public authorities such as the police due to third question, whether it is Fair, just and reasonable.
F, J and R case example, Hill V West Yorkshire Police 1989, held it was not fair, just and reasonable to impose a duty of care on the police for potential unidentified victims.