In HCI, which aspect concerns how easy it is to learn to use the software?

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

Answer: (C)

The main idea here is how quickly a new user can learn to use the software. Learnability is the aspect that captures the ease and speed with which someone unfamiliar with the program can reach a basic level of competence. It looks at the learning curve, whether controls are discoverable, and whether the interface provides helpful cues, consistent patterns, and just-in-time guidance so users can perform tasks without excessive trial and error. When an interface is designed with good learnability, onboarding is smoother, support needs are lower, and initial task success rates are higher.

Usefulness is about whether the tool helps users accomplish their goals—its value. Usability covers the broader experience of using the product, including efficiency, effectiveness, and satisfaction once users have learned it. Flexibility concerns how well the system can adapt to different tasks, contexts, or user preferences, not specifically how easy it is to learn.

Learnability best explains why the software is easy to learn for new users.