In the law of evidence, the necessity or duty of affirmatively providing a fact or facts in dispute on an issue raised between the parties in a lawsuit. The responsibility of proving a point or points; standard of proof indicades the degree to which the point must be proven. For example, in a ciril case the burden of proof rests with the plaintiff, who must establish his/her case by such standards of proof as a preponderance of evidence or clear and convincing evidence.