Documenting prototype testing helps teams track what works and what needs improvement. Good documentation captures both successes and problems, creating a clear record for making decisions.

Documentation methods include:

• Observation sheets: noting how people use prototypes
• Testing logs: tracking when and what was tested
• Photo evidence: showing how people interact with services
• Session notes: recording key quotes and reactions
• Issue tracking: listing problems that need solving
• Success metrics: measuring what works well
• Action items: noting changes needed
• Pattern logs: highlighting repeated feedback

Documentation helps teams make evidence-based improvements rather than relying on memory or assumptions. It also helps explain testing results to stakeholders and justify changes.