Theatre Testing, a method extensively employed in marketing research and advertising, involves presenting materials to an audience in a controlled setting to gather feedback and insights. While the application of Theatre Testing in marketing and advertising is long-standing, its increasing application in prevention science raises several critical questions. This article describes the Theatre Testing process, debates the merits and drawbacks of the method, and exemplifies the pros and cons by discussing the method in relation to gender-based violence prevention within the Swedish ‘open preschool’ context. Advocates of Theatre Testing argue that simulating interventions before actual implementation offers valuable insights into participant responses, which can enhance the acceptability and effectiveness of these interventions. However, the controlled setting of Theatre Testing may not accurately reflect real-world conditions, leading to potentially misleading conclusions about the intervention. One promising development in addressing certain limitations, such as reaching the target group, is the introduction of social media-based Theatre Testing.