Role playing in design asks participants to step into the shoes of a user, a service employee, or another actor in a system and to improvise their responses to a scenario in real time. It is a powerful empathy-building and idea-testing technique that brings abstract personas and journey maps to life and reveals interaction dynamics that no static diagram can capture. When teams act out scenarios before building them, they consistently discover problems, opportunities, and emotional dimensions that would otherwise surface only after significant investment.