Which of the following is a usability factor?

• A. Consistency
• B. HTML Color
• C. Caching
• D. Rendering Speed

Answer: (A)

Consistency as a usability factor means the interface behaves in a predictable way across screens and tasks. When layouts, controls, and terminology stay the same, users form mental models quickly, making learning and using the system easier and more efficient. For example, if a action button is always in the same place and looks the same across pages, users don’t waste time figuring out how to complete tasks.

The other options relate more to appearance or performance than to usability factors. HTML color affects visuals and readability, including accessibility, but by itself it isn’t a usability factor. Caching and rendering speed influence how fast the system responds, which affects user experience, but these are performance attributes rather than usability factors.