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This week we read about two types of errors. The two types are Slips and Mistakes

Slips occur when the goal is correct, but the required actions are not done properly. An example from my own life is when I walk out to my car to go to the gym and forget my car keys. My goal is correct, I want to get in my car and go to the gym, but my execution is flawed; I forgot to bring my car keys. Slips fall into either one of these sub categories:                 

  • Action-based
  • Memory lapses

Mistakes occur when the goal or plan is wrong. You have set out on the wrong path and therefore even if your executions are correct, they are still part of a larger mistake. Mistakes can be further classified into any of the following:

  • Rule-based
  • Knowledge-based
  • Memory lapses
Human Error? No. Bad Design.
Screen Shot 2017-09-15 at 3.48.43 PM.png

A few ways designers can reduce the occurrence of errors in their designs include:

  • Adding constraints to clock errors
  • Make things easy to undo
  • Add confirmation and error messages

Sources: The Design of Every Day Things, Don Norman