5.1. Initial Matrix of FactorsThe dimensions of IMF are 11×71, where 11 is the number of RE and HSEE factors and 71denotes the number of petrochemical plant’s personnel (P) asked to fill in the questionnaires. Apart of IMF is shown in Table 5. Each element ;<= of the IMF represents the importance whichemployee ‘‘j’’ gives to factor ‘‘i’’ within a range from 0 to 5.5.2. Fuzzified Matrix of FactorsThe numerical vectors of 71 elements related to each one of the 11 factors are converted intofuzzy sets. The value of thresholds DE = 4 (see Equation 12) and DE = 1 (see Equation 13) areintroduced to correct a possible deviation of ±20% between the criteria of the individualsinterviewed.5.3. Strength of Relationships Matrix of FactorsSRMF is created by applying Equations (14–17) on the FZMF (see Table 6). The value ofRYZ[,] which is equal to 0.773 in the SRMFs, shows the strong relationship existing betweenthe top management commitment (which is one of the RE principles) and ergonomics (which isone of the HSEE factors
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