1. In 1991, long before the current ISO standard, four classes of usability measures were identified from previously published usability studies:

1. Goal achievement
2. Work rate
3. Knowledge acquisition
4. Operability

Consider all the individual metrics that are covered in Chapters 4 7 in Tullis and Albert (2013). Reproduce the table below, and for each row, in Column B, enter a single metric that would fit the class in Column A.

Column A Classes	Column B Metrics
Goal achievement
Work rate
Knowledge acquisition
Operability

2. marks

What other classes of metrics (presented in Tullis and Albert (2013) as chapters), are absent from this early list of usability measurements?