In designing the interface. The mental models are essential because we know how to use systems and applications. It is easier for designers to convey concepts and create intuitive and straightforward user interfaces when they are aware of the mental models of their target audience. For instance, the user interface of a mobile app for ordering meals must adhere to the user's mental models of how they anticipate the ordering, payment, and food selection processes. This will benefit both the overall user experience and the interface's efficacy.