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You know if your audiences' expression are positive and if they are talking positively. If not, then their expressions and conversations will be just the opposite.

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You know it's working when you have made sure you have all your facts and opinions lined up and proven correctly.

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You know your winning because you have facts to prove your opinion and you also have those people that haven't mad up there mind yet .

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its working if your winninging

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if you persuasive thing is working then they will react with expression and they might say ohhhhhh yeahhhhh or i do agree with you.

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If your audience is doing what you're persuading them to do then the argument is working. If they're not doing what you're trying to persuade them to do the argument is not working.

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We will know if the persuade is working, because the product selling will increase.

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I like to shut down computers and laugh about it.

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Wassup

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You might be able to see by the emotion on their face, if they are understanding what you are saying to them by a nod of the head or a simple comment back.
You will know when they disagree also by the expression they show on their face or the way they react to your speech. For example, they might walk away or say that they aren't interested in what you are saying to them.

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Your persuasive argument is working when you have persuaded at least one person. It is not working when you have not persuaded anyone.

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you might be able to see their facial expressions that give away what your audience is thinking. same goes if the argument is not working.

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If it is working the people will start agreeing with you. If it isn't working they will disagree with you

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You will know if it is working because they will start agreeing or if isn't working they will start arguing even more.

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The person you are talking to might show some sings of support and might agree with you. If they don't agree they will argue with you

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If your argument is working then they will stop arguing with you and show signs that they agree with you such as facial expressions. But if they disagree with you they will try to justify themselves and disagree.

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If your persuasive argument is working your audience will show signs of agreement such as: changes in body language, nodding of the head, and words of agreement.