Design/methodology/approach – FDS determines the relative positions of the employees involved
in similar work by comparing them against one another, and based on their performance, the
employees receive different grades. Here the authors use the Likert’s scaling method to convert these
grades into numerical scores, then these scores are used to estimate the average performance of each
group of employees, which is referred to as the group index. Taking these group indices into
consideration, the authors propose a modified performance score of each employee for their final
evaluation. Efficiencies of the existing FDS and the proposed modified version are compared using
a simple measure of rank correlation known as the Kendall’s tau-statistic