Measuring the current availability of a system provides the basis for future availability measurement. This benchmark is a comparison between initial and subsequent usability test results. The measures are mostly user performance, but should cover all aspects of usability. Benchmarking a product or website against competitors is useful for identifying features that improve usability. To conduct a benchmarking study of user attitudes and opinions, a fully non-functional prototype can be used with a moderator who guides the user through the experience and asks questions.