Which of the following is an example of tracking functional experience?

Tracking functional experience involves evaluating how well a service performs from the user's perspective, particularly regarding its practical, everyday use. Counting the number of user errors is a clear example of this as it directly relates to how users interact with a service or product and identifies issues that affect the functional experience. A higher number of user errors can indicate potential areas of improvement in usability or functionality, affecting overall user satisfaction.

Measuring the speed of completion looks at performance metrics but does not directly assess the user experience from a functional perspective. Assessing customer satisfaction ratings provides insight into overall feelings towards a service but lacks a direct focus on functional interactions. Gathering feedback through interviews is valuable for understanding user sentiments and experiences but is more qualitative and may not focus specifically on quantifiable aspects of functional performance. Thus, counting user errors is the most straightforward reflection of tracking functional experience as it provides direct insights into the effectiveness and usability of a service or product.