3. Performance is comparable and convertible

Performance numbers not only have unambiguous meanings, but they also have
unambiguous comparisons. For example, there’s no doubt that 5 is greater than 4.
On the other hand, it might be subjective to figure out whether excellent is
better or worse than superb. Similarly, could you figure out whether epic is
better than legendary? Actually, the phrase strongly exceeds expectations
could be better than superb in someone’s interpretation. It only becomes
unambiguous and comparable after a definition that maps strongly exceeds
expectations to 4 and superb to 5.