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Performance metric type | Metric indicators (factors) | Fuzzy output |
Linguistic Variables (input) | Levels of linguistic variables | Performance index | Levels or values of output variables |
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Quality | Customer perceived quality (CPQ), robustness and axiomatic compliance | Very low, low, moderate, high, very high | Quality robustness index (QRI) | Crisp value (1–10) |
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Reliability | Critical failure, maintainability, and serviceability | Very low, low, moderate, high, very high | Rmaintainability index (RMI) | Crisp value (1–10) |
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Ease of development (EOD) | Manufacturability of the module and functional interaction between the components | Very low, low, moderate, high, very high | EOD index (EDI) | Crisp value (1–10) |
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Cost | Assembly cost, fixed cost, and standardizing cost | Very low, low, moderate, high, very high | Cost performance index (CPI) | Crisp value (1–10) |
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