One of the most common and effective methods for collecting customer satisfaction data is conducting surveys and questionnaires. Surveys and questionnaires allow you to collect quantitative and qualitative data from a large sample of customers. Various tools and platforms can design and distribute your surveys like email, web, phone, or social media. Ask your customers to rate their satisfaction with different aspects of your products or services, such as quality, features, price, delivery, support, etc. Also ask them to provide feedback or suggestions for improvement.