Käytettävyysmuuttujat

Käytettävyysmuuttujat, often translated as usability variables or usability metrics, are quantifiable measures used to assess the usability of a product, system, or interface. These variables help designers and developers understand how well users can achieve their goals efficiently, effectively, and with satisfaction. Common usability variables include task completion rate, time on task, error rate, and user satisfaction.

Task completion rate measures the percentage of users who successfully complete a given task. A high completion rate indicates that the interface is intuitive and easy to navigate. Time on task refers to the average time it takes for users to complete a specific task. Shorter times generally suggest a more efficient design. Error rate quantifies the number of mistakes users make while performing a task. Lower error rates are indicative of a clearer and more forgiving interface. User satisfaction is often measured through post-task or post-session surveys using rating scales or qualitative feedback, providing insight into the user's subjective experience.

By tracking and analyzing these usability variables, teams can identify areas for improvement in their designs. They provide objective data to support design decisions and demonstrate the impact of usability enhancements. This data-driven approach is crucial for creating user-centered products that meet user needs and expectations.