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Usability problems you discovered from the testing. Describe critical incidents encountered by the users, but don't record users' names. Record these as a series of high-level takeaways, focusing on the usability problems you saw, rather than what each participant did. For instance, you might describe how you had some learnability issues with your prototype, as evidenced by users B and C clicking all of the menus to try to find option X.
Prototype iteration
You did two rounds of paper prototyping. Describe how your prototype changed between those two rounds.