# Calculate reliability factor according to ISO 3408-5

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The modification factor for reliability is calculated according to the two parameter Weibull distribution according [ISO 3408-5](bibliography.md#iso_3408-5) if this option is set. If the option is not selected, the three parameter Weibull distribution as in [ISO 281](bibliography.md#iso_281), [ISO/TR 1281-1](bibliography.md#iso_tr_1281-1) is used.