The Deaf and hard-of-hearing population is very diverse and a number of different communication methods exist. Don’t assume that every Deaf person can read your lips and don’t assume every Deaf person uses sign language.
ATTITUDE is the most important thing! Keep in mind that most deaf people spend every day of their lives trying to communicate with hearing people, and so have many strategies for communicating with someone who doesn’t know their language. Follow their lead in a respectful, patient way. Deaf people will appreciate your efforts to communicate.
For more information, click this link: Interacting with Deaf-HOH Customers