Can you say any more about what it is that you're trying to persuade people about? One approach would be a before-and-after test. There might be all sorts of subtle psychometric tests that could be devised, but you could just ask a propensity question on a scale before and after. Use an alternative design for a control. e.g how likely is it that you would do x from -3 to 3 (or whatever scale you want).
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