Storytelling gives product design work narrative structure that makes people care without sacrificing rigor. It provides a pattern library consisting of four canonical narrative structures: protagonist-arc for empathy, choreography for service coordination, situation-complication-resolution for strategy orientation, and what-is/what-could-be for persuasive presentation. Each pattern includes specific goals, shapes, host skills, and named pathologies to protect the discipline. Use this skill when design work needs narrative structure, when stakeholders need to see the user experience as a story, when presenting design rationale to non-design audiences, or when a journey, blueprint, brief, or deck feels lifeless.