A cafe study (also called cafe testing or Guerilla usability testing) is an efficient way to run quick usability testing at a public location such as coffee shops or cafeterias. It is a useful tool for user experience designers to test features and get quick feedback without the need to set up a formal usability test, which can be time and resource consuming. In this presentation, I'll describe all aspects before, during, and after a specific cafe study I conducted at the University of Illinois Urbana-Champaign campus. You'll hear just enough about our project for context, then learn from why we decided to run this study, how the test was prepared, what happened on the testing day, and what I learned from this experience. I'll share the tools and templates I've used in this study, as well as tips for how to run a cafe study in your organization.