What is an example of a moderate change in User Interface configuration?

Adding fields to a screen represents a moderate change in User Interface configuration because it directly affects how users interact with the application by introducing new data points that can be displayed and manipulated. This type of change can improve user experience by providing additional information or options without significantly altering the underlying workflows or processes.

Unlike creating new buttons, which might drastically change the interaction model by introducing new actions for the user, or restructuring the data model, which could have far-reaching impacts on data relationships and integrity, adding fields is relatively contained. Furthermore, field validation logic, while also related to usability, typically deals more with ensuring data quality rather than changing the actual interface layout or user interactions. Therefore, adding fields strikes a balance that is characteristic of a moderate change in the User Interface.