Feedback Patterns: Errors, Confirmation, System Status
Affordance Patterns: Tap, Flick, Drag
The usability principle of feedback states “Provide appropriate, clear, and timely feedback to the user so that he sees the results of his actions and knows what is going on with the system.” Feedback can vary from simple progress indicators and confirmation messages, to more sophisticated animations and effects. Mobile feedback patterns include:
Figure 8-1. Feedback patterns
Error messages should be expressed in plain language (no codes), precisely indicate the problem, and constructively suggest a solution. Highly visible error messages on the screen, like TaxCaster and Mint, are preferable to a modal dialog, since a dialog may cover up the issue.
Figure 8-2. TaxCaster and Mint
Figure 8-3. Barnes & Noble Nook, error message in Action Sheet; Square, error message in dialog
Use plain language that offers a solution for resolving the issue. Make the error visible; use in-screen messaging instead of modal dialogs.
Confirmation should be ...