The document provides guidance on using credible personal testimonials and case studies in charity marketing materials. It discusses best practices such as actively recruiting and maintaining case studies, setting appropriate expectations, striking while the story is relevant, and gaining consent. The document also cautions that case studies may withdraw consent or be negatively impacted by media exposure, so their well-being and privacy must be protected. Overall, the document advises charities to thoughtfully develop and present impactful personal stories in their fundraising efforts while prioritizing the interests of story subjects.