UXI (User Experience Index)

The User Experience Index (UXI) is a value (0-5) which measures the overall performance and health of applications, based on the number of crashes per hour out of the total usage time, the percentage hang time out of the total usage time, and the percentage wait time out of the total usage time. For web applications, it also uses the percentage of web page errors out of all page loads, and the average page load time.

For each element of the UXI, Aternity determines a narrow range of meaningful results, beyond which it is flattened to either zero or the maximum. For example, applications should have 0% hang time, so anything above, say, 5% would be unacceptable, reducing the hang time index to zero, which would drastically lower the overall UXI score for that application.

Definition of UXI

This index is an absolute (not relative) measurement, since it does not use baselines which may vary between applications or locations. However, it is cumulative, not a spot measurement, as each reading relies on and contains those which came beforehand. Absolute measures allow Aternity to accurately use a single consistent dimension across several attributes. For example, it can display this index for a single user on a single application, or many users on a single application, or many users on many applications.

This measurement is NOT connected to activities and their response times, which applies only to managed applications, or to the quality of Skype calls (MOS).