Usability Metrics are generally done through standardized questions designed to capture a the user's sentiments about the application, product or system. The survey's pose questions to the users and provide a scale of acceptability the user chooses in assessing a particular attribute. The most common scale is based on the Likert Scales originally proposed in 1032 1).
Figure 1 gives a few of the Scales that Lickert defined. There are more available here:
|Scale||Attitude / Sentiment|
|Agreement||Strongly Disagree||Disagree||Undecided||Agree||Strongly Agree|
|Importance||Unimportant||Slightly Important||Moderately Important||Important||Very Important|
|Likelihood||Almost Never True||Usually Not True||Occasionally True||Usually True||Almost Always True|
There are two ways that user satisfaction can be measured:
ISO also provides some guidance in how to assess User Satisfaction. See: