A legal fiction typically allows the court to ignore a fact that would prevent it from exercising its jurisdiction by simply assuming that the fact is different. In cases where the court must determine whether a standard has been reached, such as whether a defendant has been negligent, the court frequently uses the legal fiction of the "reasonable man". This is known as the "objective test", and is far more common than the "subjective test" where the court seeks the viewpoint of the parties (or "subjects"). Sometimes, the court may apply a "mixed test", as in the House of Lords' decision in DPP v Camplin 1978.