Equipment selection in mining operations is an important issue, and also difficult to solve in multiple criteria environments. The paper in question has aimed to develop computer software for solving equipment selection problems in mining. In their paper, Bascetin et al. have analysed two case study problems related to openpit and underground mining method selection. By using Yager's method, the authors have selected 18 different criteria in the first case study and 21 criteria in the second case study. However, as emphasized by 0zdemir2, in pairwise comparison matrices the appropriate number of criteria should be seven as the maximum, from the point view of validation, consistency and redundancy. In cases where there are more than seven criteria to be handled, it is suggested that the criteria should be clustered and then the maximum number of clusters and subcriteria of every cluster should be limited to seven.
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