Multi-modal systems
use more than one sense (or mode ) of interaction
e.g. visual and aural senses: a text processor may speak the words as well as echoing them to the screen
Multi-media systems
use a number of different media to communicate information
e.g. a computer-based teaching system:may use video, animation, text and still images: different media all using the visual mode of interaction; may also use sounds, both speech and non-speech: two more media, now using a different mode