An interesting demonstration is the beginning of a product question.
Choose a real task.
A useful experiment starts with the work someone needs to complete. Define the input, the expected outcome and the situations where the result would be difficult to trust.
Make evaluation concrete.
Collect representative examples and identify what a good response should include. Review errors, missing information and uncertain cases as carefully as successful demonstrations.
Design the human decisions.
People need to understand when to review a suggestion, where supporting information comes from and how to correct a mistake. These decisions belong in the interface, not only in technical documentation.
Build the next smallest step.
A focused prototype can reveal whether an idea is worth developing. Its purpose is to reduce uncertainty and make the next decision better informed.