In HCI, which aspect asks how easy the software is to use?

• A. Usefulness
• B. Usability
• C. Learnability
• D. Performance

Answer: (B)

Ease of use is captured by usability. Usability asks how easy the interface is to learn, how efficiently a user can complete tasks, how easily users can remember how to operate the system, how few errors they make, and how satisfied they are with the experience. In other words, it focuses on the overall ease and quality of using the software, not just one facet.

Learnability is related but narrower—it's about how quickly someone can become proficient with the system. Usefulness concerns whether the software provides the right capabilities to achieve goals, not specifically how easy it is to operate. Performance covers speed and resource efficiency, not how easy the product is to use.