*3.4. Evaluation of the Criteria Weights*

One of the constituent parts of MCDM methods is the determination of criteria weights. The criteria weights were assessed using the subjective direct weight determination method. The majority of the present methods for the determination of criteria weights are based on the subjective expert judgment [67,68]. The direct weighting method of criteria importance was used in most cases. This widespread, while subjective, method has higher accuracy compared to the ranking method [68]. Using the criteria weights direct determination method, the sum of all the assessment weights of each expert must be equal to 100% or 1.0 [69–71].

The qualitative parameters—criteria—were provided for the experts to evaluate their importance. The calculation of the importance of a criterion *c<sup>i</sup>* is calculated according to (16):

$$\overline{c\_{l}} = \frac{\sum\_{k=1}^{r} c\_{ik}}{r} \tag{16}$$

where *cik*—the estimation value of *i* criterion by *k* expert, and *r* is the number of experts.

The weights of the criteria are calculated using (17):

$$w\_i = \frac{\sum\_{k=1}^{r} c\_{ik}}{\sum\_{i=1}^{m} \sum\_{k=1}^{r} c\_{ik}} \tag{17}$$

where *r* is the number of experts, *m*—the number of criteria, *cik*—*i* criterion by *k* expert. The assessment of the importance of qualitative parameters by experts and the calculated weight of each parameter are presented in Table 1.


**Table 1.** Evaluation of the importance of criteria and their weights.
