Hallway Usability Tests are the very least you should do to find major obstacles and inconsistencies in your interfaces before you deliver them to customers. Corinna has made very good experiences with Hallway Tests ever since she first learned about them in Joel Spolsky’s famous Joel Test.

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“A hallway usability test is where you grab the next person that passes by in the hallway and force them to try to use the code you just wrote. If you do this to five people, you will learn 95% of what there is to learn about usability problems in your code” – Joel Spolsky