Comparative negligence, or non-absolute contributory negligence outside the United States, is a partial legal defense that reduces the amount of damages that a plaintiff can recover in a negligence-based claim, based upon the degree to which the plaintiff's own negligence contributed to cause the injury. When the defense is asserted, the factfinder, usually a jury, must decide the degree to which the plaintiff's negligence and the combined negligence of all other relevant actors all contributed to cause the plaintiff's damages. It is a modification of the doctrine of contributory negligence that disallows any recovery by a plaintiff whose negligence contributed even minimally to causing the damages.