Everyone makes mistakes, so assume that something will go wrong. People will always make mistakes and there is no fail-safe product.Whether it's user error or software error, or if the designer made errors, there will always be errors.
People make errors when they are under stress. Research shows that a little stress can help you perform a task, because it heightens your awareness. However, too much stress degrades performance.
If people are performing a boring task, you need to raise the level of arousal with sound, colors, or movement. If people are performing a difficult task, then you need to lower the level of arousal by eliminating any distracting elements such as color, sounds, or movement, unless they are directly related to the task at hand.
Not all mistakes are bad. Errors with a positive consequence are actions that do not give the desired result, but provide the person with information that helps him or her achieve an overall goal.
The Morrell taxonomy classifies two types of errors: performance and motor-control. Performance errors are mistakes you make while you're going through the steps to complete a procedure. Motor-control errors are those you make while using the controls of a device.
People use different error strategies:
Systematic explorations- they plan out what procedures they'll use to correct the error.
Trial and error explorations- they randomly try out different actions, menus, icons, and controls.
Rigid explorations- doing the same action over and over even though it doesn't solve the error.
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