Читать книгу The theory and practice of argumentation and debate - Victor Alvin Ketcham - Страница 18

The first argument is always presented by the affirmative. Upon the affirmative rests the burden of proof and if the affirmative proves nothing the decision goes to the negative. “He who affirms must prove.” The affirmative has the burden of proving the proposition to be true, the negative that of proving it false. Therefore the proposition must be worded in the affirmative. This insures that some progress will have been made at the end of the first speech.

The burden of proof rests upon the party who has the risk of non-persuasion. The risk of non-persuasion rests upon the party who would fail if no evidence were introduced. We have seen that the affirmative would fail if no evidence were introduced, because he who alleges must prove. Therefore the risk of non-persuasion rests on the affirmative. To be more concrete, if you are attempting to prove to a friend that he ought to do (or ought not to do) a certain thing, you take the risk of not persuading him to do the thing that you ask, i. e. the risk of non-persuasion is on you. Likewise the salesman who approaches a customer with the purpose of selling him a bill of goods incurs this same risk of non-persuasion, because he may not be able to induce the customer to buy. Since, as in the above cases, the affirmative must be given a chance to prove something before the negative can reply, the proposition should always be worded in the affirmative.