Table 7-1: Usability indicators based on performance
1. Goal achievement indicators (success rate, failure rate, accuracy, effectiveness).2. Work rate indicators (speed, completion rate, efficiency, productivity, productivity gain).3. Operability indicators of the user's ability to make use of the systems features (error rate, problem rate, function usage)4. Knowledge acquisition indicators of the user's ability and effort in learning to use the system (learnability and learning).
Table 7-1: Usability indicators based on performance 1. Goal achievement indicators (success rate, failure rate, accuracy, effectiveness). 2. Work rate indicators (speed, completion rate, efficiency, productivity, productivity gain). 3. Operability indicators of the user's ability to make use of the systems features (error rate, problem rate, function usage) 4. Knowledge acquisition indicators of the user's ability and effort in learning to use the system (learnability and learning).
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