This document discusses how to gather and use customer testimonials effectively for marketing purposes. It provides examples of good testimonials that describe the customer's challenge, experience with the service provider, and positive results. The document recommends asking customers specific questions to elicit rich testimonials and having them sign a permission form to use their testimonial. Turning the best testimonials into detailed case studies that summarize the challenge, experience, and results is presented as an especially powerful marketing tool. Following guidelines like not editing the testimonial or writing it for the customer can help ensure testimonials are genuine and credible marketing materials.