In the law of evidence, the necessity or duty of affirmatively proving a fact or facts in dispute on an issue raised between the parties in a lawsuit. The responsibility of proving a point (the burden of proof) is not the same as the standard of proof. Burden of proof deals with which side must establish a point or points; standard of proof indicates the degree to which the point must be proven. For example, in a civil case, the plaintiff must establish his or her case by such standards of proof as a preponderance of evidence or clear and convincing evidence.