Most deaf people in Brazil communicate using Libras (Brazilian Sign Language) and, when they learn Portuguese, they consider it a second language. However, most hearing people don’t know how to communicate in Libras, because it isn’t taught in regular schools. This forces the use of a Libras’ interpreter throughout the whole process of communicating with deaf people. In this talk it’s presented the process used in Hand Talk to make a usability test, showing a little about recruiting, planning, execution and data analysis focused on deaf people.