Guerilla Testing
Fast, scrappy research in the wild. No lab required.
What is it?
Guerilla testing is an informal, low-cost usability testing method where you approach people in public spaces (cafés, co-working spaces, hallways) and ask them to try your product for 5-10 minutes. It trades methodological rigor for speed and volume of feedback.
When to use it
Use guerilla testing when you need quick directional feedback, have no budget for formal research, or want to validate early prototypes before investing in full usability studies.
How to do it
Prepare a focused prototype or flow — keep it to 2-3 tasks maximum.
Write a brief screener question to ensure the person roughly matches your audience.
Go to a high-traffic public space (café, university lobby, co-working area).
Approach people politely, explain it takes 5 minutes, and offer a small incentive (coffee, chocolate).
Observe them using the prototype, take notes on hesitations, errors, and comments.
Pro tips
Don't explain the interface — just give a task and watch. Their confusion IS the data.
5 guerilla tests beat 0 formal tests. Speed over perfection.
Record sessions on your phone (with consent) to share with stakeholders later.