1.29 Burden for Affirmative Defense/Burden-Shifting Theory is a legal concept in which the burden of proof is shifted from the plaintiff onto the defendant. In an affirmative defense, the defendant must prove that the plaintiff's claims are false. This is in contrast to a traditional burden of proof in which the plaintiff must prove that the defendant's claims are true. There are two types of 1.29 Burden for Affirmative Defense/Burden-Shifting Theory: the burden of persuasion and the burden of production. The burden of persuasion requires the defendant to prove the affirmative defense by a preponderance of the evidence, meaning that the defense must be more likely than not to be true. The burden of production requires the defendant to present evidence in support of the affirmative defense. If the defendant meets the burden of production, the burden of persuasion shifts back to the plaintiff.