What term describes the capability of a software product to provide appropriate performance relative to resources used under certain conditions?

The term that best describes the capability of a software product to provide appropriate performance relative to the resources used under certain conditions is efficiency. Efficiency is a key measure in software performance, focusing on how well a system utilizes its resources—such as time, memory, and processing power—while achieving desired results or outputs.

In an agile context, efficiency is crucial because it reflects how well a software product meets user needs without wasting resources. An efficient application not only performs its tasks quickly and accurately but does so while maximizing resource utilization, thus ensuring a balance between performance and costs.

In contrast, effectiveness refers to the degree to which a software product meets the objectives it was designed to achieve, which focuses more on the results rather than the resource consumption involved in achieving those results. Utility pertains to the usefulness of the features provided by the software, while robustness indicates the software's ability to handle errors or unexpected input gracefully. While these concepts are related to performance and quality in some manner, they don't specifically address the relationship between performance and resource usage as well as efficiency does.