• Understand the causes of error and design to minimize those causes. • Do sensibility checks. Does the action pass the “common sense” test? • Make it possible to reverse actions—to “undo” them—or make it harder to do what cannot be reversed. • Make it easier for people to discover the errors that do occur, and make them easier to correct. • Don’t treat the action as an error; rather, try to help the person complete the action properly. Think of the action as an approximation to what is desired.
