85: People make mistakes and there is no way to stop it form happening. Sort of like Murphy's Law which states If something can go wrong it will. If something does wrong an error message helps the user, and it should state what they did, explain the problem, instructions on how to correct it, written in an active voice not a passive voice, and shows an example. Try to plan for mistakes and accidents.
86: When people are stressed out they will make mistakes and they do not think or act clearly. They can perform repetitive tasks, even if they do not work. A little stress or what they call arousal is helpful cause it heightens awareness. Arousal can be designed for using distracting elements such as color, sounds or movement. Avoid using arousal design on difficult tasks.
87: User testing will help determine if there are any mistakes or accident that can be made while using a product. Sometimes there can be happy little accidents or mistakes that created when a user uses a product. It often means that something good has happened but the product was not designed to do so.
88: There are 2 kinds of errors, performance and motor control. There are 3 kinds of performance mistakes made. Commission errors in which a user does more than necessary, Omission errors where the user forgets a step, or wrong action errors where the user does the wrong thing during a task. Motor control errors are those associated mistakes of controls.
89: Sometimes people make mistakes on purpose especially if they are learning to use something new. They can systematically try every option available to get the results they want, or they can randomly try out everything they can to see what it does. Occasionally some people are so set in their ways they keep repeating the same mistake action over and over again. Sometimes older populations just take longer to do something than younger people especially when it comes to technology. Experts vs. novices is also something to take into account.
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