The purpose of this principle is to make the law and application of the law fair and consistent- Judicial precedent. A judicial precedent works: when a judge is faced with a particular case, they should apply the law in the same way as previous cases. Judges in the past determine the law for judges in the future. They set a 'precedent'. Many laws are set in this way, called a 'common law', because it is common across the country. E.g. James Bulger case.