Average number of errors made by experienced users

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average number of errors made by experienced users shall not exceed two per hour of system use. (Testable non-functional requirement) Chapter 4 Requirements Engineering 23 30/10/2014 Metrics for specifying nonfunctional requirements Chapter 4 Requirements Engineering 24 Property Measure Speed Processed transactions/second User/event response time Screen refresh time Size Mbytes Number of ROM chips Ease of use Training time Number of help frames Reliability Mean time to failure Probability of unavailability Rate of failure occurrence Availability Robustness Time to restart after failure Percentage of events causing failure Probability of data corruption on failure Portability Percentage of target dependent statements Number of target systems 30/10/2014
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