What characteristic does 'serviceability' refer to in non-functional requirements?

Serviceability in non-functional requirements refers to the ease with which software can be maintained and supported. This encompasses aspects such as how quickly and effectively issues can be diagnosed and resolved, the simplicity of modifying the system for updates or enhancements, and the overall efficiency with which software can be managed over its lifecycle. High serviceability ensures that software can adapt to changing requirements and that it can be easily debugged, which is critical for long-term sustainability and performance.

While the quality of customer service and user documentation are important, they are not directly related to the intrinsic ability of the software to be maintained. Dynamic performance under load focuses on functional aspects, specifically how well an application performs under varying workloads, which is separate from the concept of serviceability. Therefore, the focus on maintenance and support aptly defines serviceability within non-functional requirements.