If icons do different things they should ______?
Why is this important?
LOOK DIFFERENT!
If users are unable to distinguish between function of icons they may get frustrated and will take longer to learn the system.
It is important that labels (icons and text) be:
unambiguous.
the action resulting from interacting with an object should be obvious from its label.
What are the main interface category languages?
What are some “other” types of interface languages?
What are the goals of interaction?
What is direct manipulation?
User interacts with a symbolic representation of objects in the software. Visual and continuous representation of task and objects. Uses physical actions to represent actions in the software.