What is it?
We set expectations all the time, consciously or not. When users interact with your product, they make assumptions about what will happen when they make this decision or trigger that action. When the result is different from what they anticipated, it can make users feel confused. If this happens often, they may become frustrated, discouraged, or overwhelmed.
Examples
Problematic "Save" behavior leading to lost changes
No expectation settings for file format
Unexpected search modification leads to confusion
