As part of defining an approach the usability, acceptance criteria need to be defined. Which of the following acceptance criteria would be appropriate for operability?
Option B seems like the most comprehensive approach to me. Measuring the extent to which each task is achieved gives a better overall picture of usability.
I think option C is the best choice for operability. Measuring the mean time taken to complete each task is a key indicator of how user-friendly the system is.
Mean extent to which each task was completely and correctly achieved, scored as a percentage, could also be a valuable acceptance criteria for operability.
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