What aspect of usability ensures that users can quickly learn to navigate a system?

The aspect of usability that ensures users can quickly learn to navigate a system is learnability. Learnability refers to how easily new users can become proficient with a system or application. It focuses on the initial interaction with the system and how quickly users can understand its functionalities and features, which is crucial for reducing the learning curve associated with new software.

When a system is designed with high learnability, users can intuitively grasp how to use it through familiar design patterns, clear instructions, and logical workflows. This aspect of usability plays a vital role in enhancing user satisfaction and productivity because users do not spend excessive time trying to figure out how to perform basic tasks.

Other aspects like utility, efficiency, and effectiveness contribute to overall usability in different ways; for example, utility pertains to the usefulness of the features provided, efficiency involves how quickly users can perform tasks once they have learned to use the system, and effectiveness considers how well the system supports users in achieving their goals. However, for the specific context of how rapidly a user can learn to navigate, learnability is the most relevant factor.