Which of the following qualities contributes to a good user experience?

Usability is a key quality that contributes significantly to a good user experience. It refers to how easily and intuitively users can interact with a product or system. When something is usable, it allows users to accomplish their goals with minimal effort and without confusion. High usability ensures that users can navigate through a product smoothly, understand its functionalities, and achieve their tasks efficiently. This often leads to higher user satisfaction, as people appreciate straightforward systems that require little to no learning curve.

In contrast, ambiguity and complexity can negatively impact user experience. Ambiguity may create confusion, preventing users from understanding how to use a product effectively, while complexity can make interactions cumbersome and frustrating. Cost-effectiveness, while important from a business perspective, does not directly impact the user's experience with the product. Therefore, focusing on usability is essential for creating positive and effective user experiences.