Explain what a before-and-after demonstration can and cannot show

Demonstration checklist

1. State lighting and timing conditions.
2. Disclose changes in camera setup.
3. Avoid presenting one comparison as proof of universal results.

Fictional worked example

In a fictional rehearsal, a viewer treats a demonstration as a promise of the same personal result. The team turns the problem into a concrete check: state lighting and timing conditions. Next, they disclose changes in camera setup. If the answer still depends on missing information, they avoid presenting one comparison as proof of universal results.

Limits and next check

Further reading

• FDA: Cosmetics Labeling Guide (US reference)