评估广告对购买行为的影响。使用调查和产品识别测试、问卷或反馈传单以及免费电话等技术，以鼓励客户在售后互动。 Assessing the influence of advertisements on purchasing behavior. Use techniques such as surveys and product recognition tests, questionnaires or feedback flyers, and toll-free numbers in order to encourage customer interaction after the sale.