Which principle involves preventing errors and correcting them in web interfaces?

The principle that involves preventing errors and correcting them in web interfaces is Understandable. This principle emphasizes that information and operation of the user interface must be clear and easily comprehensible for all users. Ensuring that interfaces are understandable means that users can easily navigate, interpret, and interact with content without confusion.

Preventing errors might include providing clear instructions, using familiar terminology, and ensuring that all actions are logical and straightforward. Correction of errors is also part of this principle, with the expectation that users are given guidance on how to resolve mistakes or misunderstandings so they can successfully complete their tasks.

In practice, this might manifest as help text, error messages that are easy to understand, or undo options that ensure users can correct their actions without frustration. Being attentive to the Understandable principle ultimately enhances user experience by reducing the likelihood of confusion and enabling users to complete tasks efficiently.