Definition: TestRadio, literally "test radio," refers to a specific method used in early Christian churches for testing out new ideas or teaching that was controversial at the time. In this context, it involves asking listeners questions and encouraging them to respond with their answers. The goal is to gather feedback on what might work well, what might be problematic, and how it could best be communicated. This process was often used in a group setting, where many people were involved, and it was seen as a way to encourage debate and reflection about the matter at hand.