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| Metric | Description | Interpretation |
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| Characteristic: detection of usability issues |
| Total number of identified issues (TII) | This metric is the total amount of usability issues identified in the evaluated system. | The more usability issues are identified; the metric value is closer to 1. |
| Number of critical issues (NCI) | This metric corresponds to the number of critical issues identified in the evaluated system. | The more critical issues are identified; the metric value is closer to 1. |
| Number of frequent issues (NFI) | This metric corresponds to the number of frequent issues identified in the evaluated system. | The more frequent issues are detected; the metric value is closer to 1. |
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| Characteristic: time |
| Time required to complete the planning phase (TPP) | This metric corresponds to the time taken to perform the activities that constitute the planning phase. | The less time used to perform the activities of the planning stage, the better.
It must be defined: TPPc = 1 – TPP, to define relation: less (time) – more (value). |
| Time required to complete the implementation phase (TIP) | This metric corresponds to the time taken to perform the activities that constitute the implementation phase. | The less time used to perform the activities of the implementation phase, the better.
It must be defined: TIPc = 1 – TIP, to define relation: less (time) – more (value). |
| Time required to complete the analysis of results phase (TAP) | This metric is the time taken to complete the analysis of results phase. | The less time used to analyze the results, the better.
It must be defined: TAPc = 1 – TAP, to define relation: less (time) – more (value). |
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