Provide information in multiple formats, with a heavy emphasis on visual formats
Make sure your content is compatible with screen readers or other voicing tools
Provide voice captions (audio files for text)
Make sure that the voice in the audio tracks is clear and well-articulated
Make sure that the content of the audio version corresponds correctly to the text version
Provide text alternatives to non-text content (e.g. Image captions)
Transcribe audio tracks
Use video to supplement text. A moving, talking person in a video may be easier to identify and mentally process than a textual content or even a static image of a person in a photograph