Designed for Use

Takeaway Points

• Allow direct manipulation whenever possible.

• Give immediate, live feedback to any user action.

• Use gestures that don’t manipulate objects but instead invoke commands only as shortcuts rather than as primary interactions.

• Make sure people don’t have to learn complex gestures.

• Make sure people don’t have to make precise gestures; be liberal in accepting user input, but allow them to undo false input.

• Hardware that runs natural user interfaces is especially prone to interpreting unintended user actions as input. Whenever possible, prevent accidental input, and provide fallback solutions for when it does happen.

• Follow what nature does.

• Follow what popular applications do.

• Regularly test interactive prototypes of your user interface ...