The biggest challenge is overcoming the day-to-day, default assumption by most people that everyone can hear. There have been cases of deaf people being assaulted by police officers for not responding to their verbal commands, there have been others hit by cars and yelled at because the drivers assumed everyone can hear just like them and they honked for crying out loud! Most people don’t try to learn sign language in order to communicate, they leave the burden on the deaf person to compensate and keep up. Designers of systems rarely consider the deaf person by providing visual indicators just like other systems that depend on visual cues that don’t provide audio cues as well. There are enough people that are either deaf or blind (or in some cases both) that designers should consider visual, tactile, and audio cues for all their system designs. How about you, what are your personal challenges as a deaf person?