Audism is attitude.
Oppression is behaviour.
Always remember that audism is attitude & thoughts of the person.
Audism is both intentional and unintentional.
An example of audism would be a supervisor interviewing candidates for the job position. A Deaf person has had extensive knowledge of the machinery/job; working for the company for a long time. A hearing person knows nothing about the machinery/job and has only been with the company for a minimal amount of the time.
The supervisor hires the hearing person claiming the Deaf person doesn't know the job well enough based on his Deafness. He feels training the hearing person will be easier based on communication. This is audism.
Another example of audism is when a parent who has exposed their child to all aspects of communication and still doubts bilingualism; that is audism. Downplaying ASL, encouraging the important aspects of AVT and oralism.
This parent recruits opinions from almost everywhere yet still doubts the importance of ASL hand in hand with bilingualism. This is audism.
A Deaf person doubts another Deaf person's education in Gallaudet; stating Gallaudet is only good for partying, drinking and socialising. The Gallaudet graduate claims she has a B.A in education, the doubter states he has learned from rumours that the Gallaudet B.A is like another high school degree. This is audism.
Audism comes from both the hearing and Deaf perspectives.