iOS App Case Study

Guerilla Usability Tests

I conducted usability tests with 7 users (whom I interviewed while walking around UC Berkeley’s campus).


I wrote an intentionally broad script to surfaced all possible pain points in the app.


I noted all the pain points from each user and ranked them by frequency of occurrence.


  • 7/7 users thought their home page was Medium’s Top Stories.
  • 7/7 users had noticeable difficulty discovering new tags or publications to follow.

Feature Suggestion

I decided to focus on enhancing content discovery because of the apparent trouble people had with that particular task.

Task Flow

I created a task flow to explore how this new feature may integrate into the current app.


I started with low-fidelity wireframes.

Then proceeded to high fidelity wireframes.

And then created a clickable prototype.



While I was in the process of wrapping up my case study, Medium released a redesign!

Awesomely, Medium created a new feature for content discovery on the iOS app, which I’m delight share similarities with my own feature suggestion.


This Medium case study was an immersive way to think critically about a user’s needs and design a solution. The guerrilla usability interviews also pushed me into becoming more comfortable conducting usability tests.