Agile software development processes by any definition encourage the in- and-out team communication via various practices from pair-programming to informative workspace to retrospectives. With the respect to all the usual practices there is one more often underestimated way of getting the in-team feedback - the hallway testing. The term Hallway Usability Test coined by Joel Spolsky stands for "grabbing the next person that passes by in the hallway and forcing 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."
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