Unconscious errors caused by inattention to what they're doing. They intend to perform one action but end up doing another, often similar action. Some examples are embarrassing typos in a text message, hitting reply all instead of just reply, or washing your hands with lotion instead of soap.

Slips

University of Michigan - Ann Arbor

"Even better than good error messages is a careful design which prevents a problem from occurring in the first place. Either eliminate error-prone conditions or check for them and present users with a confirmation option before they commit to the action."

#5: Error prevention heuristic

World Leaders in Research-Based User Experience. (n.d.). 10 usability heuristics for user interface design. Nielsen Norman Group. Retrieved March 26, 2022, from https://www.nngroup.com/articles/ten-usability-heuristics/ 

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